Infidelity Investigations Diploma

Catching Cheating Partners – Professional Private Investigator Training (12 Modules + 8 Real-Life Stories)

Full-time: 1 week–10 days | Part-time: 2–3 weeks | Leisure pace: 6–10 weeks 40 CPD Hours

Master the specialised skills required to conduct professional, lawful, and ethical infidelity investigations. This focused diploma draws on over two decades of real-world private investigation experience and equips you with practical techniques used every day in this emotionally charged but highly demanded area of the profession.

Whether you are an experienced investigator expanding your services or building foundational skills, you will learn how to recognise patterns of infidelity, gather compelling evidence safely, support clients professionally, and deliver court-ready results.

What You Will Learn

• The 20 classic signs of infidelity and how to spot meaningful patterns.
• Psychological motivations behind cheating and emotional withdrawal.
• Advanced linguistic analysis and body language reading to detect deception.
• Following the money — financial red flags and lawful asset tracing.
• Digital forensics, OSINT, phone/computer analysis, and modern “breadcrumbs”.
• Professional surveillance techniques tailored to relationship cases.
• Building strong, integrated cases and writing objective, court-ready reports.
• Client communication, confrontation strategy, legal safeguards, and post-investigation support.

Course Structure

12 Core Modules covering behavioural patterns, psychology, linguistics, body language, financial trails, digital investigation, surveillance, report writing, and final strategy. + 8 Real-Life (Anonymised) Case Studies that bring the theory to life with practical lessons from actual investigations.

Each module includes clear objectives, practical tasks, checklists, reflection exercises, and portfolio-building activities.

Final Assessment & Certification

Complete all modules, tasks, and reflections, then sit the final 50-question multiple-choice exam (85% pass mark required for certification). Successful candidates receive the Lewis Legal Ltd Diploma in Infidelity Investigations and 40 CPD Hours.

Who This Course Is For

• Practising private investigators expanding into domestic/relationship work
• Aspiring PIs wanting a focused, high-demand specialism
• Professionals in HR, legal support, or security roles dealing with personal matters
• Anyone seeking practical, real-world skills in lawful deception detection and evidence gathering

By the end of this diploma you will have the confidence, tools, and professional standards to handle sensitive infidelity investigations competently, ethically, and profitably — while protecting both your clients and your reputation.

Ready to add one of the most requested (and rewarding) services to your investigative toolkit?