This one has nothing to do with the agreements between the US and Mexico regarding non-interference.
For channel 8 in LA, the "problem" (for them) is that they are licensed as a "low power digital" stations that is required by the rules to not interfere with stations that are licensed as "full power" (or class A). In this case, San Diego station KFMB is the station that has an interference protected contour that KFLA is not allowed to interfere with.
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