I just got my GPSr on the 5th (my birthday) and have only been out once but so far I've learned that if you're in an urban area and think you found a private little pocket chances are someone with an addiction to narcotics has found it before you.
Furthermore, if you are tracking down a cache and end up in a similar situation - check for needles! (2 out of 3 of my cache finds this weekend had a discarded needle close by)
And lastly, if you find a needle call it in to the fire station so that no-one else will have to deal with it.
