A school district policy allows any salary employee to serve as a fill-in. This policy is in place at EPISD. Details of the policy are available from the El Paso Times.

Further information on the specifics of the policy can be found through the same source. The policy's implications and implementation are not outlined here, but more details are available.

The source provides more context and explanation of the policy, which can be consulted for a fuller understanding of how it works and what it entails.