well i just got back, i found a farmacia that would sell me xanax with no script (well she took an extra 20 dollars and walked and got a script for me and came back with my copy. i got to the border and declaired it and told them my situation why i needed it and they said ok but next time im only allowed to bring 50 pills of a controlled substance at a time, and this xanax (tafil was the mex name). i had 60 1.0mg pills and said hed let it slide this time since i explained my situation why i needed em and i had a valid script bottle with refills on it from american pharmacy (HEB). he also told me if i needed more just rent a hotel room, cross the border, get 50, come back declair it and go back to mexico and get more. he to me to do this as many times as money would allow me and he really didnt care as long as i had 50 pills at a time and declared it each time. this was a US Customs Agent, pretty cool understanding guy. so i guess that 90 days supply thing doesnt fly in del rio-acuna.