You can read all about it here:
www.burtw.com
www.jmwagner.com
and, of course, here:
https://bitcointalksearch.org/topic/burtw-arrested-update-charges-dropped-934268
tl;dr: I was charged with operating a money transmittal business without a licence for my trading activity on localbitcoins.com. (profile)
Defending myself cost me almost $300,000. We had to mortgage our house and cash in our retirement savings in order to pay the three separate law firms I had to hire (one for the criminal case against me, one for the plethora of civil cases against the seized property and one for the possible IRS case against me). However, since I have paid all the taxes on my gains from Bitcoin trading and mining there is no tax evasion.
BTW: none of the expenses involved, physical damage to our home during the search and seizure, damage to our business, attorney's fees, the $80K forfeiture, etc. are tax deductible.