If one is stopped, and the officer starts asking questions which one does not wish to answer, does one have to invoke the right time after time after time; or can one simply invoke the right in general terms such as "I am invoking my fifth amendment right to remain silent; and I will, from this point, refuse to answer any further questions."?
That is sort of how I do it, it usually starts with a question such as "where are you going? (or similar), I will specifically state that I am not discussing my whereabouts or answering any further questions.
It seems a simple matter to me to just slightly modify my statement to include "My 5th amendment right"
Either way the officer/government agent is going to infer guilt, after all, the sole purpose of even speaking to me is to gather evidence to use against me or someone else.