My husband and I just returned home from a visit to Arizona Dec 3010 2011. After reading many posts on Trip advisor about "whether it is safe to cross at the nogales border into Mexico or not", we decided to go. Not only were there alot of other people crossing to and from, along with many border patrol officers (who were very nice to us), there were alot of Mexican Policio to be seen. You could not help but feel safe. There were a fair amount of stores open, depends on what you are looking for. You can definately tell they are wanting tourism $$. We found that you had to barter for a good price for a purchase. Most were accomodating, but some not so much. Needless to say we would go back again. If you are not looking for trouble, you won"t find it there. We also were there in the daytime hours.