A man has been fined $2,800 for ignoring a vet's order to flush his cat's radioactive waste down the toilet. The cat had been treated with an injection of radioactive iodine after developing a thyroid complaint. The treatment makes the cat and its pee and poop radioactive for weeks, so special care is needed. Mr. Jenness, the cat's owner, said he decided to throw the cat litter into the trash after the waste had hardened into abnormally large clumps. "I was afraid of my septic system being clogged," he said. The cat's waste was discovered at an incinerator, when alarms detected radioactivity. Workers tracked the waste to Mr Jenness after finding mail with his name on it nearby.