There is something much more going on there than you know. You need to go to another gas station around town or order them confidentially online from another source. There is much more going on there. Police are trained in academies to believe that marijuana is a gateway drug. They may also be stealing people's stuff to smoke. Honestly though there is something wrong there. I am assuming you live in a small town and that maybe your only source for papers but it is not worth the trouble. My best advice - do not go back and find another route. I assume you got it anyways and left. Well now they are watching you. Yes they can do that but they cannot harass you. Unfortunately if there is a reason for them to be suspicious then as long as they stay within their jurisdiction they can make a big deal out of it. Do not give them a reason to.