客戶來自各個階層，但他們聘用私家偵探的原因却各不相同。部份人士因遇上婚姻等問題，認為私家偵探能忠實地為委託人查到真相，因此他們求助，並且有可能以此為通姦證據申請離婚，於通姦不合法的國家裡，更可以作為控告配偶通姦或第三者妨害家庭的憑證。部份私家偵探社亦兼營討債公司。台灣通姦罪屬於刑法239條，處一年以下有期徒刑，屬於告訴乃論。 除了最大宗的婚姻問題外，徵信社在尋人這部分的業務也是其獨特之處。在目前台灣社會，除了部分戶政事務所、警察單位外，就只有徵信社是以民營公司的立場收取酬勞的。 徵信社使用的手段有時候會介於法律邊緣，是否順利找到目標、還是拿錢不辦事等，視該徵信社是否正派。但不可諱言地， 在很多情況下，要解決問題除了請徵信社外，似乎沒有更好的選擇（像是債務尋人）。這也造成台灣民眾有相關需求、但又擔心徵信社拿錢不辦事的矛盾心理。 在台灣許多的徵信工會號稱中立，但實際情況，背後的管理者仍為各大徵信社。
- 消費者心中的謎題 - 徵信社收費怎麼算？
- 求助華仲徵信社反被殺 請鬼抓藥單 - 中時電子 / 2014-2-22
- 臥底徵信社 幫派份子勒索劈腿人 - 華視 / 2011/09/07
1833年，Eugène François Vidocq（Eugene Francois Vidocq/佛朗科斯·尤根·维多克/佛朗科斯·尤金·维多克/尤金·弗朗索瓦·维多克），是一位法国 士兵、罪犯和 私掠船船长，成立了第一家著名的私家侦探社，"Le Bureau des Renseignements Universels pour le commerce et l'Industrie"（法国商业与工业联合会） ("The Office of Universal Information For Commerce and Industry")“工商统一信息办公室”，并雇佣了一些刑满释放的罪犯。 官方执法部门曾多次试图将其关闭。 在1842年，在他破获一宗贪污案件后，警方以涉嫌 非法监禁 及冒领钱财的罪名拘捕了他。 维多克后来察觉到这是一个阴谋。 他被判处五年监禁，3000法郎罚款，但上诉法院将他释放。 是维多克将罪证检举、 犯罪学和 弹道学 代入到了刑事侦查中。 他制作了第一批鞋印的石膏模型。 他创造了不褪色的 墨水 和在他的印刷厂发明了模式化证券。 他的人体测量学至今仍被法国警方部分使用。 他还因为慈善事业而受到赞誉——他声称自己从未告发过任何出于真正需要而偷窃的人。
在伦敦, 查尔斯·弗雷德里克·菲尔德Charles Frederick Field 于1852年从警署退休后，在当地设立了一个私家侦探所，菲尔德成了查尔斯·狄更斯Charles Dickens,的朋友，查尔斯·狄更斯写了一些关于菲尔德的文章。
1862年，菲尔德的一名雇员，匈牙利人伊格内修斯·保罗·波拉基Ignatius Paul Pollaky离开了他，成立了一个与之竞争的机构。虽然如今记载很少，但波拉基在当时的名气让他在19世纪70年代的各种书籍中被提及并因其在1881年的喜剧歌剧“耐心 Patience”中的“敏锐洞察力keen penetration”而被称为不朽的“帕丁顿Paddington”波拉基。
In the United States, Allan Pinkerton established the Pinkerton National Detective Agency – a private detective agency – in 1850. Pinkerton became famous when he foiled a plot to assassinate then President-elect Abraham Lincoln in 1861. Pinkerton's agents performed services which ranged from undercover investigations and detection of crimes, to plant protection and armed security. It is sometimes claimed,[誰說的？] probably with exaggeration, that at the height of its existence, the Pinkerton National Detective Agency employed more agents than the United States Army. Allan Pinkerton hired Kate Warne in 1856 as a private detective, making her the first female private detective in America.
During the union unrest in the US in the late 19th century, companies sometimes hired operatives and armed guards from the Pinkertons. In the aftermath of the Homestead Riot of 1892, several states passed so-called "anti-Pinkerton" laws restricting the importation of private security guards during union strikes. The federal Anti-Pinkerton Act of 1893 continues to prohibit an "individual employed by the Pinkerton Detective Agency, or similar organization" from being employed by "the Government of the United States or the government of the District of Columbia."
Many private detectives/investigators with special academic and practical experience also work with defense attorneys on capital punishment and other criminal defense cases. Many others are insurance investigators who investigate suspicious claims. Before the advent of no-fault divorce, many private investigators sought evidence of adultery or other conduct within marriage to establish grounds for a divorce. Despite the lack of legal necessity for such evidence in many jurisdictions, according to press reports, collecting evidence of spouses' and partners' adultery or other "bad behaviour" is still one of their most profitable undertakings, as the stakes being fought over now are child custody, alimony, or marital property disputes.
Private investigators can also perform due diligence for an investor considering investing with an investment group, fund manager, or other high-risk business or investment venture. This could help the prospective investor avoid being the victim of a fraud or Ponzi scheme. A licensed and experienced investigator could reveal the investment is risky and/or the investor has a suspicious background. This is called investigative due diligence, and is becoming more prevalent in the 21st century with the public reports of large-scale Ponzi schemes and fraudulent investment vehicles such as Madoff, Stanford, Petters, Rothstein, and the hundreds of others reported by the Securities and Exchange Commission along with other law enforcement agencies.
Private investigators also engage in a variety of work not often associated with the industry in the mind of the public. For example, many are involved in process serving, the personal delivery of summons, subpoenas, and other legal documents to parties in a legal case. The tracing of absconding debtors can also form a large part of a PI's work load. Many agencies specialize in a particular field of expertise. For example, some PI agencies deal only in tracing. A handful of firms specialize in technical surveillance counter-measures, sometimes called electronic counter measures, which is the locating and dealing with unwanted forms of electronic surveillance (for example, a bugged boardroom for industrial espionage purposes). This niche service is typically conducted by those with backgrounds in intelligence/counterintelligence, executive protection, and a small number from law enforcement entities whose duties included the covert installation of eavesdropping devices as a tool in organized crime, terrorism and narco-trafficking investigations. Other PIs, also known as corporate investigators, specialize in corporate matters, including antifraud work, loss prevention, internal investigations of employee misconduct (such as Equal Employment Opportunities violations and sexual harassment), the protection of intellectual property and trade secrets, antipiracy, copyright infringement investigations, due diligence investigations, malware and cyber criminal activity, and computer forensics work. Some PIs act as professional witnesses where they observe situations with a view to reporting the actions or lack of them to a court or to gather evidence in antisocial behavior.
An undercover investigator, undercover detective, or undercover agent is a person who conducts investigations of suspected or confirmed criminal activity while impersonating a disinterested third party. Undercover investigators often infiltrate a suspected insurgent group, posing as a person interested in purchasing illegal goods or services with the ultimate aim of obtaining information about their assigned target.
Many undercover investigators carry hidden cameras and recorders strapped to their bodies to help them document their investigations. The period of the investigation could last for several months, or in some extreme cases, years. Due to the dangerous nature of the job, their real identities are kept secret throughout their active careers. Economic investigations, business intelligence and information on competitors, security advice, special security services information, criminal investigation, investigations background, and profile polygraph tests are all typical examples of such a role.
Undercover investigators are often misinterpreted as being similar to a police officer or deputy, however, they are quite the opposite. As opposed to a police officer, a private or undercover detective is trained in keeping a low profile, and are under no requirement to wear a uniform or a badge. Police are trained to be direct in their approach unless using a disguised vehicle.
Certain types of undercover investigators, depending on their employer, will investigate allegations of abuse of workman's compensation. Those claiming to be injured are often investigated and recorded with a hidden camera/recorder. This is then presented in court or to the client who paid for the investigation.
Across the world编辑
Many jurisdictions require PIs to be licensed. Depending on local laws, they may or may not carry a firearm, some are former law enforcement agents (including former police officers), some are former spies, some are former military, some used to work for a private military company, and some are former bodyguards and security guards. While PIs may investigate criminal matters, most do not have police authority, and as such, they are only limited to the powers of citizen's arrest and detention that any other citizen has. They are expected to keep detailed notes and to be prepared to testify in court regarding any of their observations on behalf of their clients. Great care is required to remain within the scope of the law, otherwise the investigator may face criminal charges. Irregular hours may also be required when performing surveillance work.
Template:Unreferenced Section Private investigators in Australia must be licensed by the licensing authority relevant to the state where they are located. This applies to all states except the Australian Capital Territory. Companies offering investigation services must also hold a business licence and all their operatives must hold individual licences. Generally, the licences are administered and regulated by the state police; however, in some states, this can also be managed by other government agencies.
To become registered in New South Wales requires a CAPI licence, which can be applied for through the NSW Police Force website. The Australian Capital Territory does not require PIs to be licensed, although they are still bound by legislation. PIs working in the ACT cannot enter the NSW area without a CAPI license, else they will be in breach of the law. In Queensland, a private investigator need to be licensed under the Queensland Government and apply for a private investigator licence by completing an application for a security provider licence. Applicant will need to have a criminal history check and submit fingerprint.
In 2001, the government passed the licensing of private investigators and private investigation firms in the UK over to the Security Industry Authority (SIA), which acted as the regulatory body from then on. However, due to the cutbacks of this agency, licensing of private investigators in the UK was halted indefinitely. At present, no government-backed authorities in the UK license private investigators.
The SIA have announced that PIs in the UK were to become licensed for the first time from May 2015, but this is only the scheduled date for the issue to be discussed in parliament. In December 2014, Corporate Livewire produced an article written by a UK private investigator at BAR Investigations, addressing the issues surrounding private investigation in the UK.
Private investigators in the United States may or may not be licensed or registered by a government licensing authority or state police of the state where they are located. Licensing varies from state to state and can range from: a) no state license required; b) city or state business license required (such as in five states (Idaho, Alaska, Mississippi, South Dakota, and Wyoming); c) to needing several years of experience and licensing-related training classes and testing (as is the case with Virginia and California). In many states, companies offering investigation services must hold an agency license, and all of their investigators or detectives must hold individual licenses or registrations;[來源請求] furthermore, certain states such as Washington have separate classes of licensing for roles such as trainers of private investigators. A few reciprocity agreements allow a detective working in one state to continue work in another for a limited time without getting a separate license, but not all states participate in these agreements.
In 1877, Colorado became the first state in the union to institute licensing requirements for private investigators. Because of the vague definition of term 'private investigator', the law was declared unconstitutional in 1977, but reinstated on a voluntary basis in July 2012 and mandatory in June 2015.
Private investigators in Canada are licensed at the provincial level by the appropriate body. For instance, in the province of Ontario, private investigators are licensed and regulated by the Ministry of Community Safety & Correctional Services (MCSCS). In the province of Alberta, private investigators are licensed and regulated by the Alberta Justice and Solicitor General. Similar licensing requirements apply in other provinces and territories of Canada. As per the Ontario text of the [永久失效連結] Private Security and Investigative Services Act of 2005, private investigators are forbidden from referring to themselves as detective or private detective. In order to become a licensed private investigator, you must be 18 years of age or older in Ontario (in other Provinces and territories of Canada the eligible age to work may be higher); have a clean criminal record or obtain a waiver; and submit a correctly completed application for a license. You are required to complete 50-hours of basic training with an accredited source such as a university, college, or through private agencies licensed to administer the course. Upon completion of basic training, individuals are required to write and pass the basic test to obtain a private investigator's license.
There are a number of global networks which helps Private Investigators to stay connected, share resources and carry out work across borders. Some of these are World Association of Detectives and The Association of British Investigators. These organisations promote ethical practices in the profession of Private Investigator or security service throughout the world.
Notable private investigators编辑
- Rick Crouch
- Charles Frederick Field
- Dashiell Hammett (also a notable author of detective fiction)
- Anthony Pellicano
- Allan Pinkerton
- Justin Hopson
- Daniel Ribacoff
Where the characters below do not meet the strict criteria of a private investigator (i.e. available for hire) it is noted in brackets.
- Sherlock Holmes
- L. Lawliet
- Byomkesh Bakshi
- Bhaduri Moshai
- Three Investigators (Amateur juvenile detectives)
- Miss Marple (Amateur detective)
- Mitin Masi
- Harry Dresden
- Auguste Dupin (Amateur Gentleman detective)
- Nancy Drew (Amateur juvenile detective)
- Mike Hammer
- The Hardy Boys (Amateur juvenile detectives)
- Laura Holt
- Parashor Barma
- Jessica Jones
- Thomas Magnum
- Joe Mannix
- Philip Marlowe
- Veronica Mars
- Kinsey Millhone
- Adrian Monk
- Hercule Poirot
- Jim Rockford
- Mma Precious Ramotswe
- Ezekiel "Easy" Rawlins
- Simon & Simon
- Sam & Max
- Sam Spade
- Kiriti Roy
- Shawn Spencer
- Cormoran Strike
- Varg Veum
- V. I. Warshawski
- Nero Wolfe
- Angel (Buffy the Vampire Slayer)
- The Bloodhound Gang (Amateur juvenile detectives)
- Tex Murphy
- Hetty Wainthropp
- Rip Kirby
- Historique des détectives et enquêteurs privés et grandes dates de la profession 互联网档案馆的存檔，存档日期2008-03-15. – "Le Bureau des Renseignements Universels pour le commerce et l'Industrie”
- Private Detectives and Investigators. United States Department of Labor, Occupational Outlook Handbook, 2010-2011 Edition. 2010. （原始内容存档于2015-07-02）. 引用错误：带有name属性“main”的
- Kate Warne America's First female Private-Eye. Pimall.com. [2013-02-14]. （原始内容存档于2012-07-10）.
- 5 U.S. Code 3108; Public Law 89-554, 80 Stat. 416 (1966); ch. 208 (5th par. under "Public Buildings"), 27 Stat. 591 (1893). The U.S. Court of Appeals for the Fifth Circuit, in U.S. ex rel. Weinberger v. Equifax, 557 F.2d 456 (5th Cir. 1977), cert. denied, 434 U.S. 1035 (1978), held that "The purpose of the Act and the legislative history reveal that an organization was 'similar' to the Pinkerton Detective Agency only if it offered for hire mercenary, quasi-military forces as strikebreakers and armed guards. It had the secondary effect of deterring any other organization from providing such services lest it be branded a 'similar organization.'" 557 F.2d at 462; see also GAO Decision B-298370; B-298490, Brian X. Scott (Aug. 18, 2006).. （原始内容存档于2016-03-04）.
- What does an Undercover Detective do? (with pictures). Wisegeekedu.com. 2015-06-26 [2015-07-27]. （原始内容存档于2015-07-09）.
- Gun Show : Undercover : Report on Illegal Sales at Gun Shows (PDF). Nyc.gov. [2015-07-28]. （原始内容存档 (PDF)于2015-10-15）.
- Queensland;, The State of. Apply for a private investigator licence | Security (manpower) licence. www.qld.gov.au （英语）.
- Regulation of Private Investigations. Sia.homeoffice.gov.uk. [2015-07-27]. （原始内容存档于2015-07-28）.
- Top Stories. Corporate LiveWire. 2014-12-17 [2015-07-27]. （原始内容存档于2015-09-21）.
- Private Investigator Licensing Requirements. pursuitmag.com. [1 May 2018]. （原始内容存档于8 October 2017）.
- Private Investigators: Licensing and Legal Issues in the US. Nationwide Investigations Group. [27 November 2016]. （原始内容存档于27 November 2016）.
- Private Investigator License Requirements. privateinvestigatoredu.org. [2015-12-11]. （原始内容存档于2015-12-22）.
- The Significance of Colorado PI Licensing. PInow.com - Find Local Investigators. [2018-08-30] （英语）.
- How to Become a Private Investigator in Colorado - CO | License for PI Jobs and Training School Requirements. privateinvestigatoredu.org. [2018-08-30] （美国英语）.
- Apply for a Licence. Government of Ontario. 2016-09-07 [2016-12-12]. （原始内容存档于2016-11-24）.
- Private Investigator. Government of Alberta. [2016-12-12]. （原始内容存档于2016-12-20）.