Two men who played a prank on their friend serving as a grand jury foreman by writing an anonymous threatening note and leaving it on his car could face criminal charges, according to the Pinal County Sheriff's Office.

Last week, a Casa Grande man serving as a foreman on a grand jury reported finding an anonymous note written on a restaurant guest check left on his truck during a break from the court proceedings, Tim Gaffney, a Pinal County Sheriff's Office spokesman said in a news release. 

The note said "You better not find my dad guilty! I followed you home last Wednesday I know where you life, (expletive)! Early Road sound familiar." 

Detectives contacted the company who makes the guest checks to try to identify which business it came from based on the check's serial number, but the company could not provide that information, the release said. 

Detectives then began visiting restaurants to find out where the check came from. A waitress at a Florence restaurant said she found a similar note written on a guest check left near the cash register and believed the handwriting belonged to another waitress. 

When detectives spoke with the waitress who wrote the note she said two diners asked for something to write on and said they were going to play a joke on a co-worker who was serving on a grand jury, the release said. One of the men wrote the note, but then asked the waitress to re-write it so the friend wouldn't recognize their handwriting. 

"The waitress told the men it was a bad idea because their friend would probably call the sheriff," the release said. "They convinced her by telling her they would tell their friend the following day at work." 

Detectives found the name of one of the men through his credit card receipt and called him at work. 

The man said the incident was a prank he and another co-worker were playing on their friend and they were going to admit to it when the man came into work. 

"Hopefully the men find it as funny when they are involved with the judicial process as detectives sill submit the investigation to the county attorney's office and ask they review the case for criminal charges including, influencing a juror, disorderly conduct and threatening and intimidating."