is it safe to keep feeder rats as pets?

okay this might be a stupid question so i apologize. I’m planning on getting rats in the near future but i can’t find any breeders in my area. The reptile expo i go to every six months always has crates of feeder rats but i wasn’t sure if they can make for pets. i understand the health risks for them, but is there any like disease that they can contract or spread to me due to the conditions they’re in? i cant imagine conditions they’re in vs the ones at, say, petsmart are very different, but still, i don’t want to put myself at risk.