Alexandre Ribeiro – Certified Private Investigator
LIDEPPE | WAD | IKD | APDPE
24/7 Confidentiality
Private Investigator Trofa and Santo Tirso
Private Investigation Agency
Private Investigation Agency
Trofa and Santo Tirso
Private Detectives Portugal has a presence in Santo Tirso and Trofa through a team dedicated to the operational challenges of this industrial and residential area. Our local base works in complete synergy with our agency in Porto , allowing for seamless coordination.
We combine practical knowledge of the region with the technical expertise necessary for highly complex investigations, ensuring a swift, discreet service with full legal validity. All investigations are supervised by Detective Alexandre Ribeiro — Partner No. 33 of LIDEPPE, member of WAD, IKD and APDPE — guaranteeing the rigor and professional ethics that are the hallmark of our brand.
Geographic Effectiveness with Absolute Secrecy
With tactical control of the main road exits and local connecting axes, such as the A3 , A41 and EN14 , we guarantee continuous surveillance and short or long-distance monitoring without security breaches.
Our coverage spans the entire Greater Porto area, ensuring that our clients benefit from the same high standards of quality and confidentiality in every part of our network, including our branches in Vila Nova de Gaia, Gondomar, Matosinhos, Maia, Valongo & Ermesinde, and Vila do Conde & Póvoa de Varzim.
Regardless of the area where you require evidence gathering or technical surveillance, our intervention protocol is perfectly aligned, facilitating an agile, integrated, and cross-municipal response.
Leaders in Research Business and Industrial in the Ave Valley
The high density of the Ave industrial cluster makes this region a critical point for corporate risks . Intellectual property theft, economic sabotage, and internal fraud can destroy the financial health of a business.
Combating Fraudulent Absenteeism and False Sick Leave
The abuse of fake sick leave represents a severe cost for local industries. Our detectives conduct routine monitoring and control to verify whether an employee on sick leave is actually engaged in other economic activity or feigning their incapacity. Through specialized corporate investigation support in Porto, we deliver detailed reports that serve as irrefutable evidence in dismissal proceedings for just cause .
Counterintelligence , Unfair Competition, and Trademark Protection
We operate in the monitoring of fleet diversions , diversion of raw materials , leakage of confidential information to direct competitors, and counterfeiting networks that infringe patents and trademarks in the Santo Tirso and Trofa region, frequently extending our operational checks to the neighboring municipality of Maia .
Investigation of Betrayal and Risky Behaviors
If you suspect infidelity on the part of your partner, a sudden deviation from routines or schedules should be investigated. We activate our specialized marital and infidelity investigation service to monitor routines in public places, restaurants, hotels, and suspicious outings in the Santo Tirso-Trofa area, providing you with a robust evidence dossier including high-definition photos and videos .
Other Areas of Expertise
Beyond the business and marital cases that characterize this region, we also provide support in asset investigations — inheritances, divisions of property, and hidden assets — and in technological investigations , including wiretapping detection and digital forensics. See the full range of services for more details.
Frequently Asked Questions
1. Do you have a permanent local team in Trofa and Santo Tirso?
Our operation here works in close coordination with the Porto Agency, which allows us to mobilize a dedicated team for the area whenever a case requires it.
2. Do they conduct investigations that cross municipal boundaries, for example as far as Maia?
Yes, it's a common situation, especially in business cases linked to the industrial cluster of the Ave Valley. Our network is prepared to follow a case across several municipalities.
3. How much does an investigation cost in Trofa or Santo Tirso?
We do not work with hourly rates or a public price list. We provide a fixed price after a free initial assessment, with local travel expenses already included.
4. How do they prove a fraudulent sick leave?
Through monitoring and control of the employee's routines, verifying if they are engaged in other economic activity during the sick leave period. The final report serves as evidence in dismissal proceedings for just cause.
5. Do you investigate intellectual property theft and trademark counterfeiting?
Yes, it is a significant part of our activity in this region, given the density of the textile and footwear industrial cluster in the Ave Valley.
6. Do I need to go to an office to open a case?
It's not mandatory. The process can begin by phone, video call, or email, with the same contractual formality.
7. Do they perform electronic sweeps and bug detection in a business environment?
Yes, it's a frequent request in this region given the risk of information leaks to competitors — detection of wiretaps, hidden cameras, and GPS trackers in vehicles and facilities.
8. Do they conduct surveillance at night or on weekends?
Yes. Most useful surveillance takes place outside of normal business hours, and the team adapts to the specific routine of each case.
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