Refusing a lie detector test is not evidence. Witnesses can be used to testify, but if they were at a distance, how would they know what exactly the boys where drinking? Did someone witness her buy the drinks for the boys? Holding hands and kissing a 16-18 year old boy is inappropriate given her position at a school, but it's not against the law if the boy was over the age of consent, and he consented, which it sounds like he did.
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