A DRUG'S SIGNATURE

To the Editor:

Re "Telltale Isotopes in Marijuana Are Nature's Tracking Devices"
(Aug. 21): Violent crimes go unsolved every day, but we waste limited
resources performing elaborate forensic tests on medical marijuana
seized from licensed dispensaries operating legally under state laws.
If the federal government is so interested in tracking medical
marijuana's origins, simply stop forcing desperate patients into the
shadows, and instead provide them safe, legal access to medical marijuana.

ABRAHAM L. HALPERN, M.D.

Mamaroneck, N.Y.