That just means the results you want are diluted by an ocean of irrelevant results. Try searching for:
“control the encounter” police
The addition of police to the search term string nicely filters out the irrelevant stuff.
the accusation of theft is a separate issue from controlling the encounter. FWIW, the only claim I’ve seen about how the cop grabbed the kid appears to come from the mother, who is herself reporting it second-hand from her kid, so expect some bias there. From the OP’s article:
I’ve looked at a few other articles, but didn’t see any more detail about the nature of the initial physical contact between the two.
I wasn’t there, so I can’t say for certain; I would speculate that maybe the cop put a hand on the kid’s shoulder because he was concerned the kid might flee the scene if he was just verbally confronted. Or maybe he put a hand to direct the kid somewhere else for a chat (as adults in positions of authority sometimes do to kids), and that’s when the kid got agitated.