they searched your car while you were in the car? never heard of that... why did u have a vial of test when going over the border? do you have a passport? where was the test when they found it? just out of curiosity...what is your age/stats?
maybe this brush with the law is a wake up call to hold off cycling. imo, just stick around this site and read the stickies. there's a lotta good info on here. no need to rush into things... and no need to cross the border to pick up syringes.