STUART (CBSMiami/AP) — The arrests of a former Florida sheriff’s deputy are being called into question.

Twenty people have served notice they will file a lawsuit against a Florida sheriff’s office and a fired deputy for a series of questionable drug arrests.

TCPalm newspapers report that the lawsuit will bring claims of wrongful arrest, false imprisonment and other claims against the Martin County Sheriff’s Office and former Deputy Steven O’Leary. An official notice of intent to sue was recently filed.

O’Leary was fired in January after an investigation into several of his drug arrests, some of which turned out to include substances that were not drugs. State prosecutors are looking into 80 of O’Leary’s drug arrests over an 11-month period.

Attorney Lance Richard says the 20 people he represents for the pending lawsuit all had their charges dropped.

The sheriff’s office continues to investigate O’Leary.

(© Copyright 2019 CBS Broadcasting Inc. All Rights Reserved. The Associated Press contributed to this report.)