Features of reliable security seals:

The outer surface of the security seals should carry a serialized identifier and the name, logo, or initials of the organization using the seal. The lettering and numbering should be readable and should be engraved, molded, punched, or otherwise applied in a way that prevents removal or alteration of the letters and numbers without leaving apparent damages. The seals should be sequentially numbered with sufficient alphanumeric or numeric symbols to prevent duplication of symbols in use at the facility. A seal should be applied to a container in a manner that ensures the contents cannot be removed from the sealed container without compromising the integrity of the seal or the container. A seal should be applied immediately after the samples and data have been taken to identify and measure the contents of the container. For nondestructive analysis measurements, the measurement may be taken after the seal is applied.