SIOUX FALLS, S.D. (KELO) — South Dakota Attorney General Marty Jackley highlights one illegal substance in particular when discussing marijuana laced with opioids or other drugs.

“We have seen this before,” Jackley said Monday. “It’s not very common in relation to marijuana. We’ll oftentimes see it with heroin or other dangerous controlled substances, but we have seen it before with marijuana.”

Jackley’s office on Friday announced a recent case concerning marijuana which appeared laced with opioids. Jackley does not identify the exact community on which the investigation is centering, only saying it is in southeastern South Dakota. The attorney general says the case serves as a warning about what is available on local streets.

“We, of course, ask citizens to not use illegal drugs but to be mindful that we now have situations and examples where marijuana or other illegal drugs are being laced with opioids,” Jackley said.

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Jackley says if someone does use an illegal drug and feels in any way sick, they should call 911 right away. Adam Zishka, deputy sheriff captain with the Minnehaha County Sheriff’s Office, says there are elements of the unknown with such a combination.

“With any street drug, you really don’t know exactly what you’re buying,” Zishka said Monday.

But exactly what someone might be ingesting isn’t the only unknown; there’s also the question of quantity and how much of a potentially devastating substance is entering the body.

“It can be potentially fatal, whether that’s laced with methamphetamine or, of course, fentanyl or another opioid,” Zishka said. “You just don’t know how much you’re going to ingest when you’re using that.”