What can this be from?

4 Pre-Construction Strategies to Prevent Subterranean Termite Damage
You be the judge.

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What a fantastic idea! (WAFI)

In your opinion, would the treatment be best performed (similar to this photo) inside the crawl and not into the CMU block?

Holes are too far away form the wall but concept is OK.
Except unless added the block void was not treated.

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When I was in the pest business our company was treating a best buy. The technician drilled the block and didn’t check the elevation. When he got to the back he drilled straight thru the wall, and into 20 tv’s on shelves. Lucky for him the manager of the store asked the tech to come and see what he did before he treated.

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