Last spring, as Central American children flooded into Texas in a way he had never seen in his three-decade career, Border Patrol agent Robert Harris decided to experiment.

His intelligence analysts estimated that 78 percent of the guides smuggling other migrants were Mexicans younger than 18 — teenagers often hired or conscripted by drug cartels that knew they would not be prosecuted if caught — and he wanted to attack this loophole.

FULL REPORT

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