If I purchase bitcoins via p2p, can I get some problems if the bitcoins I get were involved in some criminal activity ? If yes then how do I avoid such situation ?
It's really a good question to debate upon.
But to be seriously honest, then I haven't came across such an incident from anyone in the internet.
Cmon, P2P transactions are legal, and guess what almost all the Bitcoin transactions are unable to track, until and unless you linked your address in one of your social media profile.
Moreover if you want to remain more secure while doing BTC transactions, then use mixer for safety.
At last you can conclude that, you did not need to take any sort of tension while doing P2P transactions. Also if you don't feel purchasing Bitcoins from P2P deals, then give a shot at popular exchanges.