A Foristell woman is accused of trying to conceal heroin behind a stamp that was mailed to a Warren County Jail inmate.Authorities reported that a brown powder was located on two stamps on the outside of a suspicious envelope and tested positive for heroin. An arrest warrant was issued for Michaela Hinson, 22, on Tuesday. She is charged with felony drug distribution. A $25,000 bond has been set.Inside the envelope was a letter signed by “Ky,” which was later identified as Hinson, according to the probable cause statement. During multiple recorded phone calls between Hinson and the inmate, authorities learned about items that were being mailed to the jail, they said.Distribution charge filed against woman who mailed heroin to jail