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Them. reporter: consumer advocates say if you receive one of those non-renewal letters. contact your insurance company. ask to see copies of the image in time to correct whatever problem was identified. i don t know anyone who doesn t have dirt on their roof. reporter: that s how he fought back, paying $500 for an independent roof inspection. he said safe co has since reversed its decision. the company has not responded to our multiple requests for comment about their use of aerial technology. do you think the insurance company was trying to drop you? based on what they sent us, yes. i don t think there s any other conclusion. reporter: a new reality transforming how home owners are monitored from above. adrienne broaddus, nbc news, san francisco. when we come back, there s good news tonight. the graduating senior who had a special thank you for his kindergarten teacher. the grad who had a special thank you for his kindergarten teacher. [cough] ....