Taking great care to remain within the law (e.g., being forbidden to trespass on private property or break into homes) is also required, on pain of losing their licences as well as facing criminal charges. Irregular hours may also be required when performing surveillance work (e.g., outside someone's house during the early hours of the morning).
Private Investigators also undertake a large variety of work that is not usually associated with the industry in the mind of the public. For example, many PIs are involved in process serving, the personal delivery of summons, subpoenas and other legal documents to parties in a legal case. The tracing of absconding debtors can also form a large part of a PI's work load. Many agencies specialise in a particular field of expertise. For example, some PI agencies deal only in tracing. Others may specialise in technical surveillance countermeasures, or TSCM, which is the locating and dealing with unwanted forms of electronic surveillance (for example, a bugged boardroom for industrial espionage purposes).
Increasingly, modern PIs prefer to be known as "professional investigators" rather than "private investigators" or "private detectives". This is a response to the seedy image that is sometimes attributed to the profession and an effort to establish and demonstrate the industry to be a proper and respectable profession.