Final answer:
Investigators should be careful and professional when developing and maintaining liaison contacts. They should approach potential contacts through professional email protocols and select appropriate people to interview. Safety, scheduling, assistance, and ethical standards are important considerations in conducting research.
Step-by-step explanation:
When it comes to investigators developing and maintaining their own formal and informal liaison contacts, the investigator should be careful and professional. They should approach potential contacts through professional email protocols to set up interviews or gather information. It is important for investigators to select appropriate people to interview, ensure safety, and schedule research in advance. During interviews, it is common to use recording equipment with the informant's permission. Investigators should also assist their contacts whenever possible and adhere to ethical standards when conducting research involving human subjects.