AI content detectors are supposed to separate human writing from machine output, but they're surprisingly unreliable in practice. I ran my own essay through three popular tools, and one flagged it as 98% likely AI-generated while another said 12%, which makes me wonder if these systems are just guessing. Teachers and editors are starting to use them as gatekeepers, yet false accusations can damage reputations without any solid proof. Should we trust software that can't even agree with itself when deciding what counts as authentic human work?