I will also be looking into a good voice recorder.
Come on now you should already have one given all the fun fun experiences people have had with police.
Speaking of fun with police, have you seen the "don't talk to police" video?
If someone on the government dole started getting lippy with me, calling me stupid and such, I'd be demanding a supervisor and would most certainly drop the "sirs" and such. Just me.
I know hindsight is 20/20, just saying that it might be worthwhile to go into 4th/5th amendment modes pretty quick. No point in standing there getting insulted.