I assume you mean legal trouble? If so, then you have nothing to worry about as far as that goes. There's always the remote possibility of a US government led shutdown, as the full legalities of online poker in the US are shaky at bets atm, but otherwise it's all good and you will never directly get into "trouble".
Be sure to make sure to carefully read and understand the terms and conditions of whatever site you chose to deposit on. I can't stress this enough. I've seen hundreds of members here complaining about deposit/withdrawal methods and conditions when they never took the minute or two to read about what they were getting into.
Do your homework, follow directions, and you'll enjoy your experience with the site.