The Hidden Dangers of Hiring an Unlicensed Private Detective in Prague

If the subject later files a complaint with the Czech Data Protection Authority (ÚOOÚ), the person who commissioned the surveillance is treated as a controller or joint controller of that processing. Fines are administrative, not criminal,  but they are real, and they land on the client, not on the operator who has by then disappeared.

This is not bad luck. It is the predictable outcome of hiring an unlicensed private detective in the Czech Republic. The dangers are not theoretical, and they are not limited to "low quality work." They are legal, evidentiary, financial and personal — and the client almost always carries the consequences, not the operator.

1. In the Czech Republic, private investigation is a regulated trade

Under Czech law (Act No. 455/1991 Coll. on Trade Licensing, in conjunction with Act No. 119/2002 Coll. and the GDPR), private investigation is a concessioned trade. To operate lawfully an agency must hold the appropriate trade licence (živnostenské oprávnění), be entered in the Trade Register with a valid IČO, and process personal data under a documented GDPR basis. Exero Group is registered under IČO 09022104 and operates exclusively within this framework.

An "investigator" without that licence is not a discounted alternative. They are an unauthorised operator. Anything they do — surveillance, pretexting, photographing a subject, pulling registry data, approaching a witness — is being done outside the regulatory regime that makes the work admissible and lawful in the first place.

2. The evidence usually cannot be used

This is the part most clients only discover after the fact. Czech civil and criminal courts evaluate not only what evidence shows, but how it was obtained. Surveillance footage with no chain of custody, witness statements taken without proper identification of the interviewer, photographs lacking time stamps and metadata, or material gathered in violation of GDPR proportionality, will routinely be challenged — and often disregarded — under §125 of the Civil Procedure Code or the equivalent criminal-procedure rules.

We have personally reviewed dozens of files prepared by unlicensed operators for divorce, custody and corporate matters in Prague. The pattern repeats: dramatic content, zero procedural integrity. The lawyer cannot file it. The insurer cannot rely on it. The board cannot act on it. The money is gone.

3. You inherit their GDPR liability

Under the GDPR and Czech Act No. 110/2019 Coll., any covert collection of personal data — photos, video, location, identifiers — requires a lawful basis, a proportionality assessment and proper data minimisation. Licensed agencies document this before fieldwork begins. Unlicensed operators almost never do.

If the subject later files a complaint with the Czech Data Protection Authority (ÚOOÚ), the person who commissioned the surveillance is treated as a controller or joint controller of that processing. Fines are administrative, not criminal — but they are real, and they land on the client, not on the operator who has by then disappeared.

4. You may be exposed to criminal liability

Unlicensed operators routinely cross lines that licensed agencies will not. Trespass, unlawful interception of communications, illegal use of GPS trackers, impersonation of officials, and bribery of registry or telecom staff are all crimes under the Czech Criminal Code (Act No. 40/2009 Coll.). When the operator commits them on your instructions or on your behalf, prosecutors look upstream. "I didn't know they would do that" is rarely a complete defence.

5. The subject is warned — permanently

Surveillance has one shot. A subject who notices a clumsy tail, a parked car that returns three days running, or a stranger asking neighbours questions, will change behaviour. Phones get swept. Routines change. Assets move. Conversations migrate to encrypted apps. From that moment forward, even a licensed team operating perfectly will struggle to recover the picture.

Most of the unlicensed operators we encounter in Prague have no surveillance training, no counter-surveillance discipline, and no concept of operational security. They burn the case in the first 48 hours and then bill for the next two weeks of "observation."

6. There is no recourse when it goes wrong

A licensed agency carries professional liability insurance, is subject to the Trade Licensing Office, can be sued in Czech civil court, and is reachable via a registered seat. An unlicensed operator typically has none of this. When the file collapses, you cannot recover the fee, you cannot compel them to produce their working materials, and you often cannot even prove who they were.

How to verify a Czech private detective in five minutes

• Ask for the IČO and verify it on ARES. Confirm the trade includes investigative services.
• Ask for the registered seat and the name of the responsible representative (odpovědný zástupce).
• Ask for proof of professional liability insurance.
• Ask for a written engagement letter describing scope, deliverables, lawful basis under GDPR, and fee structure — before any work begins.
• Ask whether reports are produced with chain-of-custody documentation suitable for filing under §125 OSŘ.

If the operator hesitates on any of these, the answer is no. The cost of walking away at that point is zero. The cost of proceeding can run into hundreds of thousands of crowns, a lost custody hearing, a regulatory fine, or a criminal complaint.

The bottom line

An unlicensed private detective in Prague is not a cheaper version of a licensed one. It is a different product entirely — one that produces unusable evidence, creates legal exposure for the client, alerts the subject, and offers no recourse when it fails. The few thousand crowns "saved" up front are routinely the most expensive line item in the eventual case file.

If you are weighing a sensitive matter — divorce, custody, fraud, due diligence, missing persons or asset tracing — speak to a licensed Czech investigator first. Contact Exero Group for a confidential same-day consultation, or read our client checklist before hiring a private investigator in Prague.

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