Borderline (1950)

The Los Angeles Police Department and the Federal government are both pursuing a narcotics smuggler (Raymond Burr) who's been smuggling narcotics from Mexico to the U.S. The LAPD sends an undercover policewoman (Claire Trevor) to Mexico to infiltrate the smuggler's gang. Directed by William A. Seiter (YOU WERE NEVER LOVELIER), this minor programmer goes down easily enough. Trevor seems a might "mature" for her role, this would be her last romantic leading lady role. From here on, she played character parts. Fred MacMurray plays another undercover cop and he's fine. There's a bit too much unnecessary humor in the movie for my taste. I think it would have played better as a straight noir-ish thriller. The film has fallen into the public domain but the transfer I saw pretty good. With Roy Roberts, Morris Ankrum and Charles Lane.