Associated Press

Health and industry experts in Michigan are raising concerns about caregiver-produced medical marijuana following the discovery of more than 50 pounds of contaminated product.

The Detroit News reports that caregivers grew a majority of the marijuana that was recalled in January from provisioning centers in Detroit, Lansing, Jackson, Kalamazoo and Ypsilanti. The products contained chemical residue, E. coli, arsenic, cadmium and salmonella.

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The Medical Marijuana Licensing Board is allowing licensed facilities to purchase caregiver-produced product through March 31 to close a supply gap.

David Harns is a spokesman for the state Department of Licensing and Regulatory Affairs. He says caregiver-produced products do not need to meet state testing standards, but that patients can have them examined at a safety compliance facility.