You just slap a label on it "stool softener" and no one wants to examine it too closely.
I think 'urine sample' would be more effective. Keeps the folks out of my salad dressing at work. (Of course, I didn't write 'urine sample' on it, but I have a bunch of hermetically sealed urine sample containers that were left over from a study I worked on and they were going to be thrown out so I brought them home. They don't leak!!)
