A Johnson City man is jailed on Aggravated Assault and a host of other charges following a report of a male threatening a female with a gun. Officers responded to the area of E. Unaka Ave and soon developed 29 year old Johnathan P. Johnson as the suspect. Investigators then located a vehicle that Johnson was a passenger in and conducted a stop. Police located a forty caliber handgun with an altered serial number making unidentifiable along with a large amount of marijuana and more than 16 grams of methamphetamine.