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A man in California was arrested on Thanksgiving when he couldn’t explain why he had a human skull in his trunk.

Joshua Davis, 41, was a passenger in a car that was pulled over in Angels Camp in Northern California before midnight last Thursday after the driver ran past a stop sign, according to the Los Angeles Times.

Angels Camp police reportedly recognized Davis from when he had driven the car earlier and asked him for identification, which he initially refused. Police found Davis didn’t have a valid driver’s license.

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Upon searching the car, law enforcement found methamphetamine behind the car’s fuel tank door, in addition to a human skull that Fox 40 reported looked like it was “recently unearthed.”

Police said that Davis “invoked his Miranda rights and refused to explain how he came to be in possession of the human skull.”

The 41-year-old was reportedly arrested on charges of suspicion of violating his probation, driving with a suspended license, possessing methamphetamines and disturbing human remains.

The Calaveras County Coroner’s Office will work to identify the human skull.