What is the federal law on opening other peoples mail in the state of Texas?
Federal laws apply to all states. Nothing overrides a federal law. Example: marijuana is legal in the state of Washington. however, you can still be arrested and prosecuted at the federal level. Anything pertaining to federal such as mail, mail carriers, post office building are all protected under federal laws. You would serve more time and pay a heavier fine for opening someone's mail than for stealing the most expensive items from a jewelry store.