A blue tag is a type of notice issued during a livestock scale inspection indicating that there is a problem with the trucking scales, but it can still be used. However, the owner of the scale is required to repair the issue within 30 days. If the scale is not repaired within that time frame, it may be ordered out of service. Blue tags are typically issued for less severe issues that can be resolved relatively quickly and easily. It is important for the owner of the vehicle scales to address the issue promptly, as continued use of a faulty scale can result in inaccurate weight measurements and potential financial loss or disputes.