It’s not what the Good Book was intended to be used for: two people are in trouble for allegedly trying to smuggle a Bible laced with heroin at a county justice center in Ohio.

Law enforcement officials say an officer examined the Bible using a K-9 dog during a standard sweep of deliveries back in December, according to the Hamilton County Sheriff’s Office as reported by the Associated Press.

When the officer noticed a coffee-like stain, the book was sent to the coroner’s office for further testing. The office later confirmed that the substance was heroin, and a narcotics unit determined that there were about 30 to 40 hits of the drug within the book.

The book had been sent by 39-year-old Tehani Teepe to 28-year-old Timothy King, prompting authorities to charge both with illegal conveyance of contraband in a correctional facility.

Heroin is an opioid that is found naturally in the opium poppy, and is typically administered by injection directly into the body. It is two to four times more potent than morphine and acts more quickly on the brain. It can also be ingested in other ways, such as by smoking or with suppositories.