- employer - employee relations
- tracking down of bugging devices
- field service
- assault; slander / libel
- fraud and larceny
- applicants“ identities
- matrimonial and civil disputes
- utility model infringements
- trademark piracy
- disputes between landlord and tenant
- patent infringements
- scrutiny of staff
- scrutiny of references
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- black economy
- sexual offenses
- maintenance (support) claims
- embezzlement
- breach of public trust
- parent and child cases
- defamation
- traffic cases
- insurance fraud
- industrial espionage
- anticompetitive violations
- white-collar offenses
- producing witnesses
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