One question we are often asked is: should I hire a private detective in a criminal case?
Being accused of a criminal offence can be overwhelming, particularly where allegations involve sexual or domestic abuse. In these situations, it is natural to want to take control and explore every possible avenue to defend yourself, feeling desperate to do everything to prove your innocence. You may also feel that slow or little to no progress is being made throughout the investigation of the allegations made against you, and that you can speed things up by hiring a private detective to do the work.
The answer to whether a person should hire a private detective is not always straightforward. While private investigators can sometimes play a role in building a defence, there are also significant legal and strategic risks to consider. This article explains when hiring a private detective may help—and when it could harm your case.
What Does a Private Detective Do in a Criminal Case?
A private detective (also known as a private investigator) is an individual who gathers information on behalf of a client. In the context of a criminal case, they may:
- Conduct surveillance
- Locate and interview potential witnesses
- Carry out background checks
- Analyse publicly available or digital information
However, it is important to understand that private detectives do not have the same powers as the police. They cannot compel individuals to provide information, access restricted data, or act outside the law.
Why Do People Consider Hiring a Private Detective?
If you are facing a criminal allegation, you may feel that relying solely on the police investigation is not enough, or the police are not helping you as the accused. Common reasons people consider hiring a private detective include:
- Wanting to gather evidence to support their innocence
- Trying to identify inconsistencies in an allegation
- Finding witnesses who may support their account
- Feeling proactive during an uncertain and stressful time
While these motivations are understandable, acting independently without legal guidance can create serious problems.
It is important to firstly understand that criminal defence lawyers can undertake considerable work to build your defence whilst you are under police investigation, this is referred to as pre-charge engagement. This can take place between the police and your lawyers throughout the police investigations, allowing your lawyers to obtain and present defence material to assist in providing defence evidence.
The Risks of Hiring a Private Detective in a Criminal Case
Evidence May Not Be Admissible
Not all evidence obtained by a private detective can be used in court. If information is gathered improperly, it may be excluded, rendering the effort—and cost—ineffective. There are special rules within the criminal courts regarding evidence, and all evidence must be admissible and obtained fairly.
You Could Damage Your Own Defence
A key risk when asking “should I hire a private detective in a criminal case?” is that uncoordinated investigations can undermine your legal strategy. Evidence collected without oversight may conflict with your defence or inadvertently strengthen the prosecution’s case.
It is also important to think how hiring a private detective would be viewed later down the line if your case is before a jury, the credibility and behaviour of the accused at all times is scrutinised during a criminal trial, limiting potential scrutiny is important.
Risk of Harassment or Interference Allegations
Contacting a complainant or witnesses—directly or through a private investigator—can lead to allegations of harassment or witness interference. In serious cases, this could result in additional criminal charges or bail breaches.
For example; instructing a private investigator to look into the affairs of the accuser or a person related when you are accused of offences such as harassment, stalking, coercive and controlling behaviour can aggravate the offence you are accused of and make you look worse.
Lack of Regulation
Private investigators in the UK are not fully regulated. Standards vary, and some may use questionable methods that could expose you to legal risk.
Always Speak to a lawyer First
Before considering whether to hire a private detective in a criminal case, you should seek advice from an experienced criminal defence lawyer.
A lawyer can:
- Assess the strength of the evidence against you
- Identify whether further investigation is necessary
- Ensure any evidence gathered is admissible and strategically useful
- Gather evidence which will support your case
and whilst doing all of this, ensuring your legal interests and position is protected.
Crucially, when a private investigator is instructed through your solicitor, their work may be covered by legal professional privilege, offering an additional layer of protection.
When Might Hiring a Private Detective Be Appropriate?
There are limited situations where a private detective can add value to a criminal defence, but this should always be carefully managed by your legal team.
Examples may include:
- Tracing and locating independent witnesses
- Verifying timelines or alibis
- Gathering supporting background information
Even in these cases, the investigation must be conducted lawfully and in line with your overall defence strategy.
Alternatives to Hiring a Private Detective
In many cases, there are safer and more effective alternatives:
- Your legal team can request further lines of enquiry from the police
- The prosecution has a duty to disclose relevant evidence
- Defence teams can instruct expert witnesses (such as digital forensic analysts)
- Statements can be taken properly through your legal representatives
These routes ensure that any evidence is gathered in a way that strengthens—rather than jeopardises—your case and is carried out in line with the rules which govern the obtaining of evidence.
Key Takeaways: Should I Hire a Private Detective in a Criminal Case?
- Hiring a private detective is not always beneficial and can carry serious risks
- Evidence obtained improperly may not be usable in court
- It may make you look worse and strengthen the prosecution case
- Independent investigations can unintentionally harm your defence
- You should always seek legal advice first before taking any action
How We Can Help
If you are facing allegations of a criminal offence, early legal advice is essential. Our specialist criminal defence lawyers have extensive experience in handling complex and sensitive cases, including allegations of rape, historic allegations, indecent image offences and domestic related abuse offences.
We take a strategic and discreet approach to every case, ensuring that any investigation is conducted lawfully and in your best interests.
Contact Us
If you are asking yourself, “should I hire a private detective in a criminal case?”, speak to us first. We can provide clear, confidential advice and guide you on the best course of action.
Contact our team today for expert support.