[wintertime]

allegedly sent lewd text messages to the boy after the encounters. They were intercepted by the boy's mother, sparking the police investigation.
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There were text messages. Unless someone had access to his phone, they likely came from this teacher. The article doesn't give specifics about how many or how often the boy was texted.

[Ramius]

I don’t know. I wasn’t speaking to the facts in this particular case, whatever they might be. This guy might have been guilty, or not, but I was talking about sex crime cases in the larger context.