Do not assume that injuries or pre-existing medical conditions are inherently prohibitive. Just be sure to give as much notice as possible. Emergencies Asking about emergency procedures can also reveal a great deal about the level of expertise and legitimacy of a whitewater rafting outfitter. If you are especially concerned about the certifications or qualifications of your outfitter, you can double-check the company's references with state and local park commissions. But before you jump into a tiny piece of rubber and go careening over waterfalls, you should at least be able to handle yourself in an emergency.
Deaths are incredibly infrequent on guided rafting tours.
Remember, your guides are equipped with all sorts of first aid and emergency equipment. If you fall out of your raft, float downstream on your back until a guide can get to you. What a beautiful thing.