Actually, everyone (besides you) who posted helped to soothe my feelings quite a bit, thanks again everyone!
Anyway, it has been ~10 months and I haven't heard anything from the police, so I think I'm in the clear. I posed this question because I wanted to get an idea of how likely it would be that I would run into legal trouble. I had searched this site and others to try to find an answer, but ended up finding nothing. So, if you were in a similar situation and are looking for answers, this is what I have to say: If you're in Hawaii, and had an encounter with the police similar to the one I had, then I'd say you're probably not going to get arrested. However this is just one "data point", so it is impossible to extrapolate a trend.
Also, to LdiJ and Stevef: I sincerely thank you for your concerns about my health, but not everyone who does drugs is an addict. I buy H only a few times a year. I'm not saying that I think that it is OK to ever do heroin, or that you're incorrect in saying that I should make life changes, I'm just saying that I'm not an addict. That is an important distinction that I wish more people, especially those involved in legal matters, would recognize. I had a friend about 5 years ago and we both used heroin about once a month. One day he was smoking it in his car alone and got arrested, and they made him go to NA meetings and rehab for 6 months as part of his sentence. At the NA meetings and in rehab he met real addicts, and after they all "graduated" from the treatment program they stayed in touch (this is advised by the treatment center to create "support network"). Eventually one of the druggies he had made friends with relapsed, and my friend started doing drugs with him. Now my friend is a full-blown addict and I blame it on this idea that people have that anyone who does drugs must be an addict. Considering how much of a problem opiates are becoming, I think it is important that people stop thinking in such black and white terms and really try to understand the nuances of drug use. Especially those involved in the legal sphere.