CONROE, TX --A Conroe Police Department officer was fired on allegations he used the department's letterhead to purchase weapons for personal use and avoid paying taxes. Officer David Demura was indicted Tuesday by a Montgomery County grand jury on a charge of tampering with a governmental record, which is a felony, according to a Conroe Police Department statement. An investigation was launched in late February after the police department received a tip that one or more of its officers had been using Conroe Police Department letterhead to buy and possibly resell weapons. Using letterhead to buy the weapons allows police departments to avoid federal firearms checks and taxes. But since federal investigators allege Demura used the letterhead to buy weapons for personal use, they say he violated federal firearms laws and state laws. Investigators also say they discovered discrepancies in paperwork that deals with the purchase and transfer of the weapons in question. Several other officers were being questioned through the course of the investigation, but they were cleared of any involvement. All the weapons involved in this case have since been recovered. It wasn't immediately clear whether Demura has been taken into custody.