There never was any actual suspicion of CSAM. I assume its what they tell you to get you to let your guard down or make you more inclined to comply.

“Well, I don’t have any CSAM, so it’ll be a quick search and they’ll let me go”

I have heard of another instance where customs claimed they wanted to search a phone for CSAM despite actually wanting to find something else. It worked in that instance.

5 to 50 watts

And blinding everyone around you too!