[4] In 2019, Speaker of the Maryland House of Delegates Adrienne A. Jones appointed Barron to chair the Joint Committee on Fair Practices.

[5] In this capacity, he investigated the circumstances surrounding the $238,250 severance package paid to Roy McGrath, the former director of the Maryland Environmental Service and the chief of staff of Governor Larry Hogan.

[16][17] Barron led the prosecution of Baltimore State's Attorney Marilyn Mosby[18] former Hogan chief of staff Roy McGrath,[19] and Frederick County Sheriff Chuck Jenkins.

[20] In January 2025, Bloomberg Law interviewed 25 current and former employees in the Maryland U.S. attorney's office found a pattern of management challenges under Barron's leadership, including low employee morale, communication failures, historic lows in new criminal cases brought, and complaints about office leadership from judges and officials at the highest level of the Justice Department.

[23] In March, the House Judiciary Committee voted 17–3 to adopt the "Barron-Wilson amendment"[23] repealing mandatory minimums for nonviolent drug offenders while increasing penalties for leaders of gangs and organized crime.

[25] In August 2016, Barron and four other state legislators sent a joint letter to Attorney General Brian Frosh to review the constitutionality of setting bail without considering whether a defendant could afford to pay under the 14th Amendment.

The Attorney General's office responded to the letter in October by issuing an opinion stating that such a system was a possible violation of due process.

[35] In May 2016, Barron and Marc Korman released a list of Metro reform proposals, including ideas involving dedicated funding, the make-up of the Washington Metropolitan Area Transit Authority board, and vendors in stations to boost revenue.