My sister worked as a waitress at a bar and grill. She quit the last week of December 2009 because the atmosphere was bad (1 owner is a drunk and the other is pushing drugs through the place) and it was costing her money to go to work. Well I guess they got mad at her because everyone else was quitting on them too. She said she had 5 checks that added up to $150+ that are all under 90 days old. Well on her last check she had her friend that still works up there bring it to her. It was for $0.00 and with a note attached saying if she didnt have the checks cashed by Dec. 31 2009 they were canceling them all. Well she didnt get the note till after the first of the year and has a pretty good hunch that they didnt even write the note till the 31st (seeing as she quit earlier that week). Can they legally do that?