Gonna go right out and try some - sounds like fun

Hate to say but this will cut down on the number of drug addicts — permanantly...
From the London Daily Mail:

The terrifying flesh-eating drug meant for horses that is now hitting the streets of America: 'Tranq dope' Xylazine accounts for a third of OD deaths in Philadelphia - and causes festering wounds when injected

• • Doctors say xylazine - a muscle relaxant intended for large animals like horses - has been appearing in the illicit drug scene in cities across the US joining fentanyl as one of the primary narcotics used to cut opioids
  • The drug prolongs the highs felt from heroin, but results in users passing out for hours at a time, while injection points ulcerate and lead to grisly wounds that spread across the body
  • Some users even report severe soars erupting across their body where they never injected the drug, and many are left disfigured as fingers, arms, feet, legs and toes are forced to be amputated
  • In Philadelphia - considered to be ground zero for the xylazine crisis - about one-third of all fatal opioid overdoses in 2019 were related to the drug

It is not an opiate so the simple test kits can not see it.  Sepsis and ulceration are what kill the user.