What are the signs of heroin usage? My brother just went thru detox and was acting very strange last night. He said he feel asleep in the bathroom when I found him there at 4:30 am. I have a big bag of paper hot cups that he took into his room. I asked him what was he doing with them and he said he was playing with them. Finally, he had really bad gas and kept going to the bathroom. Is this behavior related?