Two nurses went to the hospital on Monday after opening a letter at the Florida Civil Commitment Center, DeSoto County officials said.
A Charlotte County hazmat team tested the letter and did not find anything suspicious, according to officials. Both nurses were released from the hospital later in the afternoon.
The Florida Civil Commitment Center is a privately-run facility that treats sex offenders, in addition to providing mental health and substance abuse treatment. It is located just off SR-70 near the DeSoto Correctional Institution.