MACON, GA.-- The Georgia Bureau of Investigation’s Crime Lab is reporting what preliminary results say is in the lethal street drug that has caused several deaths and more than a dozen overdoses in Central Georgia.

The GBI Crime Lab said tests are indicating that the fake yellow pills that read "percocet" are a mixture of two synthetic opioids. One of the drugs is consistent with fentanyl analogue. The GBI aid Fentanyl analogue had not previously been identified by their lab.

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Further testing and analysis needs to be done to confirm the full identity of the drug. The GBI said the full test on the pills will require more time. They said doing these tests is their top priority right now.

Authorities said this investigation is a joint effort among local and state hospitals, federal partners and groups like The Georgia Bureau of Investigation, the Georgia Department of Public Health and the Georgia Poison Center.