Yea, ER docs love tramadol for that reason. They can prescribe it and not have to worry as it's non-controlled. Oddly enough, there are a minority of people who really like tramadol compared to other 'stronger' opiates/opioids. Tramadol is available without any other substance added, is non-controlled, and has a long half life (stays in your system for a long time). One of it's major metabolites hits your opiate receptors pretty good, too.
Actually, people would be suprised at what non-controlled substances are out there... some are over the counter and are very easy to get... I don't think you even have to be 18 for some. Some are just other plants.
There are plenty of non-scheduled benzos.
There is a drug that you can buy at your drug grocery store that is very closely related to meth that you can take without any preperation.
Getting morphine/codeine is painfully easy. There are other 100% legal herbs that have chemicals that are orally active and much stronger than morphine.
Plenty of legal cannabinoids.
The list goes on and on. The government keeps scheduling drugs, and people keep finding newer chemicals to stay a step ahead. One will get popular enough to get the attention of the DEA or whoever, be taken off the market, and another takes it's place.