A new form of synthetic marijuana that's laced with rat poison is affecting residents in five states including Indiana.
The guidance to hospitals and clinics instructs them to be on the lookout for people complaining of severe bleeding not related to an injury, or when the bleeding occurred after using synthetic marijuana.
Many different chemical compounds are used to manufacture so-called synthetic marijuana. While the substances are intended to mimic the effects of marijuana, they are often far more dangerous for users.
Other cases of severe and life-threatening bleeding have been reported in four states: Illinois, Maryland, Wisconsin and Missouri.