I am generally very diligent at picking up my dogs poo. I always (well ok, almost always, about 95-99% of the time) I have at least one bag with me per dog. But I have to admit that every once in a great while I will either forget a bag or I may run out if someone decided to poop twice or I had to give one away to someone else in need. If that is the case and they pooped in an area where it is likely to get stepped on I will move it out of the way with a stick or the like.
But there are also times that I won't pick up poop even if I have a bag, of course those times are always only when we they poop in the woods & there is no way anyone will step on it because you'll get torn up by the prickers in the way or the like.