You have to be so careful punting in the US. A friend went to Boston with work early last year and decided to have a US punt. He actually walked straight in to one of the many sting operations the Boston PD like to set up.
He spent the next day in their local lockup (which he said was the single most frightening place he has ever been) before going in front of the judge. He got a fine of over $2000, a misdemeanour conviction and was deported with a 10 year ban on returning.
Obviously, his employer wasn't too thrilled when he arrived back in the UK early. As he could no longer travel between the US and UK for work he lost his job.
If you want to punt in the US, you really do need to be very careful.