Don't! Except you know what you are doing.

Scammers are likely professionals while you probably aren't.
If you try to scam back, you're open for blackmailing like "you'll give me money or I report you to the police for attempted scamming".
Scammers likely have sophisticated methods to keep himself anonymous while you probably don't, this means your odds sitting in a court room because you breaking some laws is more likely.