I'm pretty sure they do, but the explosive (literally) nature of the situation negated all of them. A few people died in the original incident, iirc.

The one safety measure of note is the relief well. They're not required to drill them along with the primary well. I read somewhere that it's not this way in Canada, and that BP had been lobbying them to let them drill without a relief well. Good luck with that now, BP. Hopefully we'll see a law that requires relief wells here in the US.

Of course, they're scrambling to drill a relief well now, which they predict will be done in early August.