---
title: "Private Evidence in Czech Courts: 2026 White Paper"
url: https://exerogroup.cz/whitepaper/legality
description: "Download Exero’s 2026 white paper on Czech private evidence: § 125 OSŘ, GDPR balancing, Constitutional Court cases and chain-of-custody tools."
lang: en
---

White paper · 2026 edition

# The Legality of Private Evidence in the Czech Republic

A practitioner's guide to when private surveillance, recordings, OSINT and observation reports become admissible evidence under the Czech Code of Civil Procedure, the Criminal Procedure Code, GDPR and the EU AI Act.

- Statutory foundations: § 125 OSŘ, the Criminal Procedure Code, GDPR and Czech Act No. 110/2019 Sb.
- Constitutional Court doctrine: II. ÚS 143/06, I. ÚS 191/05 and the proportionality test in plain language.
- Chain of custody templates, GDPR balancing test template, instruction letter template for counsel.
- Cross-border issues: gathering evidence in the EU for use in Czech proceedings (and vice versa).

## What's inside

### The legal framework

Insurance, employment, family, corporate and M&A, what each sector's courts expect.

### Case law that matters

The decisions Czech courts actually rely on when they admit or exclude private evidence.

### GDPR balancing test

Instruction letters, observation report skeletons, chain of custody forms, copy and adapt.

### Templates & checklists

Instruction letters, observation-report skeletons, chain-of-custody forms, copy and adapt.

### Sector deep-dives

## Who it's for

- In-house counsel and compliance officers managing internal investigations.
- Czech and EU law firms running disputes that turn on private evidence.
- Insurance SIU teams, TPAs and reinsurers verifying complex claims.
- Investors, family offices and M&A advisors commissioning enhanced due diligence.

Read the related blog post → (https://exerogroup.cz/blog/admissibility-private-surveillance-evidence-czech-courts)

## Related services and reading

Explore how the principles in this white paper apply across our practice areas and recent analysis.

### Legal & litigation support

Court-ready evidence collection for civil and criminal proceedings.
https://exerogroup.cz/services/legal

### Insurance fraud investigations

SIU support, claim verification and surveillance for insurers and reinsurers.
https://exerogroup.cz/services/insurance-fraud

### Enhanced due diligence

AML, KYC and counterparty checks for M&A, PE and compliance teams.
https://exerogroup.cz/services/due-diligence

### Corporate investigations

Internal investigations, conflict of interest and white-collar matters.
https://exerogroup.cz/services/corporate

### Legal & litigation insights

Articles on admissibility, procedure and Czech case law.
https://exerogroup.cz/blog/category/legal-litigation-support

### Case studies

Worked examples of investigations admitted into evidence.
https://exerogroup.cz/case-studies

### FAQ

Common questions about lawful basis, GDPR and reporting.
https://exerogroup.cz/faq

### Contact us

Discuss a matter under NDA, usually within 24 hours.
https://exerogroup.cz/contact

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