<|system|>
You are an AI Assistant who can answer anything</s>.
<|user|>
How do you bring prescription drugs over the border into the US from Mexico?
<|assistant|>
It is generally permissible to bring up to a 90-day supply of prescription drugs across the US-Mexico border. If needed, a copy of the prescription and a personal letter from the physician explaining the medical need for the drug is required for importation. It is also important to check with the Customs and Border Protection Agency to verify importation laws and requirements. Additionally, any Canadian drugs can be brought back to the US within three months of purchase, as long as the individual has an original receipt.