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Down that the public health interest of the students k-12 was to case them in face-to-face learning. there's a variety of negative public health consequences. that happened as a consequence of doing virtual learning. i think it's imperative that we get the kids back to face-to-face learning and do all we can to keep them there. >> here's dr. marty makary. he said we don't have the information. no studies have been done that tell us whether or not kids should be masked. are they safer when they're masked in the school environment? here's what he had to say. get your thoughts on the other side. ...

Existing security protocol was not safe. it was not adequate. so we need to go to the next step. and we're going to put our police officers in the school until such time as we get a report out of newtown we take a look at how we can improve security, all of the guys are keeping our students safe. >> what effect do you think that might have on the children and on the school environment having armed guards present at facing these threats in a very tangible way and having to see an armed guard in their school? >> we've had school resource officers in marlboro township for years. the program has g...

cancer-causing agents and because of the vicinity and the children that are involved. you didn't care. >> these parents have every reason to be angry. the children's school had toxic chemicals and even worse, they were the last to know. prescription for cheating. they read our x-rays, but the investigation reveals a disturbing question over the certification of many radiologists. >> isn't it cheating? >> revealing investigations. fascinating characters. stories with impact. this is cnn properties with your host tonight, brooke baldwin and dr. sanjay gupta. >> we begin with a rare loo...