The Denton County Sheriff's Office is asked the public for help in catching a man captured on surveillance video doing the unthinkable.Police released the footage of a man ripping down the national flag outside the Denton County Courthouse, Monday, and then tossing it in the middle of traffic.Matthew Emerson Reynolds, 29, is the alleged perpetrator who is no stranger to police. His rap sheet includes criminal trespass and lying to police.Police say he now faces a criminal mischief charge for his latest flag-tossing act.Unfortunately, this incident is not a first for Denton County.Around the same time last year, cops were searching for a man who also tore down flags outside the courthouse. The culprit was identified as Michael James Wagemann, a seven-year veteran of the Fort Worth Fire Department.