Authorities from the Karnes County Sheriff's Office, ATF and Homeland Security were investigating the trio, who haven't been identified due to the ongoing investigation. Authorities caught them in an H-E-B parking lot in Kenedy, a small town about 60 miles south of the Alamo City.
The suspects were reportedly busted with 1.36 pounds, or 604 grams, of crystal meth worth an estimated $60,000. Law enforcement officials believe the suspects intended to sell the drugs.
The suspects are now in federal custody and facing charges including delivery of a controlled substance.
Stay on top of San Antonio news and views. Sign up for our Weekly Headlines Newsletter.