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Marital and partner cases

Infidelity Detection - Professional Detective Services for Marital and Relationship Cases

Uncertainty can be more painful than the truth. When your partner’s behavior changes, distance appears, secrets grow, and your intuition tells you “something isn’t right” – that’s the moment to act.

Ministry register RD-9/2017 Court expert — Gdansk, Torun, Elblag and Warsaw 5.0 from 55 Google reviews Operating since 2016

In short

In an infidelity case a detective conducts discreet surveillance, documents the partner's behaviour with dated and located photographs and recordings, carries out environmental interviews and verifies alibis. The result is a report that can be submitted in divorce proceedings. All activities are carried out by licensed detectives under the Polish Detective Services Act.

Detectum Agency specializes in infidelity investigations throughout Poland. We operate discreetly, effectively, and in full compliance with the law and privacy standards. We assist individuals who want reliable evidence of infidelity – photos, recordings, and reports – that can be used in court or in a conversation with a partner.

profesjonalny detektyw w sprawach małżeńskich i partnerskich

Professional detective in marital and relationship cases

Many people who have entrusted us with infidelity cases previously felt uneasy but lacked evidence. Here are the most common signs of infidelity we observe in practice:

  • change in routine - more frequent outings, “business trips,” late returns,
  • hiding the phone - new passwords, abruptly ending calls,
  • new appearance - sudden style changes, perfumes, increased self-care,
  • lack of intimacy - emotional or physical distance,
  • unclear explanations - inconsistent stories, mysterious meetings,
  • unexplained expenses - restaurant bills, hotels, gifts,
  • aggression or excessive control - attempts to deflect attention.

A single sign does not necessarily indicate infidelity, but a combination of several should prompt a conversation or professional investigation.

Methods used by detectives in infidelity cases

Infidelity detection requires discretion, experience, and precision. Each case is different, so our approach is always tailored individually.

Illustration for: Infidelity investigations

Discreet surveillance

Detectives conduct surveillance of a person suspected of infidelity – on foot, in a car, or using optical equipment. We collect data on locations, meetings, and contacts.

Photo and video documentation

We create evidence of infidelity in the form of photographs and recordings confirming the partner’s actual behavior. The materials are dated and can be used in court.

Background and environmental inquiries

We collect information from people around us – discreetly, without revealing the source of the inquiry.

Digital analysis and forensic IT

If necessary, we work with IT experts who help recover data from devices and applications, always within the limits of the law.

Alibi verification

We check whether the partner actually stayed where he declared – using monitoring, GPS or team observation.

All activities are conducted by licensed detectives in accordance with applicable laws.

Evidence is a key element in any infidelity case. At Detectum, we prepare a complete documentation package that can be used in legal proceedings:

  • photos and video recordings with date, time, and description,
  • detailed detective report,
  • documentation confirming legal compliance,
  • materials in digital or printed form.

Reports are clear, chronological, and factual – and can serve as valid evidence in divorce and financial cases.

Illustration for: Infidelity investigations

Costs and stages of an infidelity investigation

The cost depends on observation time, location, number of detectives, and equipment used. We always present a full cost estimate before starting.

Consultation

Free discussion to understand the situation and possible actions.

Action plan

Selection of methods, schedule, and scope of surveillance.

Execution

Discreet observation and evidence collection.

Final report

Delivery of photos, recordings, and written report.

Legal guidance

Provided as part of combined services – both investigative and legal support.

Transparency and trust – no hidden costs, full confidentiality, and legal compliance.

Sample cases (anonymous)

Case 1 “Business trips that never existed”

A client requested surveillance of her husband, who frequently traveled “for work.” Within three days, it was established that he was meeting another woman. Photos and recordings confirmed the infidelity.

Case 2 “The phone that revealed everything”

Behavioral analysis and observation of a partner provided clear evidence of infidelity. The report was used in divorce proceedings.

Case 3 “A double life”

Detectives determined that the client’s wife had rented a second apartment. The collected evidence confirmed infidelity in court.

Frequently asked questions

Infidelity investigations — questions and answers

What are the signs of infidelity?

The most common signals are a changed routine and frequent business trips, a hidden phone and new passwords, a sudden change of appearance, emotional or physical distance, contradictory explanations and unexplained spending on restaurants, hotels or gifts. A single sign proves nothing — several at once are a reason to check.

Is evidence of infidelity collected by a detective valid in court?

Yes, if it was collected lawfully. Photographs and recordings carry the date and place, and the report is prepared in a form that can be filed in divorce proceedings. Material gathered privately, in breach of the other person's privacy, can turn against the person submitting it.

How long does an infidelity case take?

It depends on the observed person's routine. Some cases close after a few days of surveillance, others require several weeks of work in selected time windows. The scope and expected duration are agreed during the free consultation.

Will my partner find out?

No. Surveillance is conducted discreetly by field detectives and only the client knows about the assignment. Confidentiality is a statutory duty of a Polish detective, not just a promise.

Can a detective access my partner's phone?

No, and we do not do it. Accessing someone else's phone, email or messaging without their consent is a criminal offence in Poland. Digital analysis is performed only on devices and data the client is legally entitled to.

Where we work

Gdynia, Gdansk, Sopot and all of Poland

Our head office is in Gdynia at Podolska 21 and our branch is in Gdansk at Jana Heweliusza 11, unit 811. Most of our work takes place in the Tricity area and Pomerania — Gdynia, Gdansk, Sopot, Rumia, Reda, Wejherowo and Tczew.

We also have field units in several regions of the country, and our mobility together with cooperation with other licensed detectives lets us run cases throughout Poland and beyond its borders.

Map of Detectum detective agency units in Poland: Gdynia, Warsaw, Poznan, Zlotoryja, Czestochowa

Contact

Let's talk — the first call costs nothing

Our offices

Head officeGdynia

ul. Podolska 21
81-321 Gdynia

BranchGdańsk

ul. Jana Heweliusza 11 lok. 811
80-890 Gdańsk

Phone

+48 666 607 600

E-mail

biuro@detectum.pl

Credentials

Detective licence no. 0002591 issued by the Regional Police Commander in Gdansk. Licensed detective agency entered in the register of the Polish Ministry of the Interior under number RD-9/2017. Court expert in private investigation and investigative techniques at the Regional Courts in Gdansk, Torun, Elblag and Warsaw.

Orły Ochrony 2022 Winner of the Orły Ochrony 2022 award

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