I was called in once and they took a role call and then said that everyone would be dismissed because the trial had been post poned.

I've received the letter in the mail stating that I may be selected at least 3-4 times. Since I don't get paid through my work if I were to be selected, I have a lady in human resources type me up a letter stating that it would be a financial hardship and I mail it in and get out of it.