I agree better safe than sorry, I remember the first time I went there we nervous wrecks, we had drove down from WSU in washington to get our supplements and we had the whole trip to imagine the worst and how we could hide the shit on the way back, put everything in the bottom of a half eaten dorito bag, we thought. We drove across and people were running next to the car trying to sell us stuff, freaked us out, we immediately turned around and went back across through customs. The agent asked if we had any illegal drugs or animals and other stuff. THen he goes how about steroids? Definitely not we replied he looked up at the secondary search and said "I just started today, I dont feel like being an asshole yet" WE all chuckled and he let us through. Pretty close if we did have anything. Its far easier to walk across and take the cabs or buses. Plus if you do drive you need mexican car insurance because if you get into a car accident youre f**ked, because they wont let you go until its paid. Anyhow now I dont even think about it, the population is so dependent on gringos spending money that they want you to be safe. The mexican people have always been very nice and there are some good cheap restaurants there. Good Luck, let me know how it goes.