Simply refusing to answer is a good tactic.
One almost as good is say, Here, let me turn on my recorder, so that there is no question about what was said during this conversation.
The FBI refuses to conduct interviews that are recorded. So, they would likely leave you alone.
Another good tactic is to say - I do not recall, I do not remember, I do not know. The Clintons are famous for that one.
Number of times that Clinton figures who testified in court or before Congress said that they didn’t remember, didn’t know, or something similar.
Bill Kennedy 116
Harold Ickes 148
Ricki Seidman 160
Bruce Lindsey 161
Bill Burton 191
Mark Gearan 221
Mack McLarty 233
Neil Egglseston 250
Hillary Clinton 250
John Podesta 264
Jennifer O’Connor 343
Dwight Holton 348
Patsy Thomasson 420
Jeff Eller 697