An AFID or Anti-Felon Identification tags, are disc shaped objects that are released when a Taser gun is discharged. The unique serial numbers or alphanumeric strings on these tags can be backtraced to the manufacturer who can then provide the identity of the purchaser.
A sundown town is a place which is it not a local ordinance; it is more an unwritten rule or custom, whereby someone who is Black (or other person of color) is not permitted to stay outside after dark. It tends to be an issue in the Southern United States.