One week in, more than 100 health providers have signed up to certify patients for medical cannabis.

According to the Minnesota Department of Health, 54 out of 104 health professionals who applied, including doctors, got the green light from the state to certify patients to receive medical marijuana for treatment of a qualifying condition, such as epilepsy or cancer.

It is unclear why 50 percent of the applicants haven't been certified.

Manny Munson-Regala, assistant commissioner for the Minnesota Department of Health, said it may take time to verify practitioners' credentials.

"It's probably a mix of different things," he said. "We want to ensure that they in fact have one of the appropriate licenses."

A physician, physician's assistant or advanced practice registered nurse who has primary responsibility to care for a qualifying patient is eligible to participate in the program.

The numbers reflect the first week of registration, from June 1...