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In this Tuesday, Oct. 11, 2016, photo, Remi, a dog trained to sniff out sources of water pollution, with handler Karen Reynolds, sniffs a stormwater drain pipe in South Portland, Maine. Many communities across the country are saving time and money by using dogs to find sources of pollution instead of gathering samples to be sent to laboratories for testing. (AP Photo/Robert F. Bukaty)

In this Tuesday, Oct. 11, 2016, photo, Remi, a dog trained to sniff out sources of water pollution, with handler Karen Reynolds, sniffs a stormwater drain pipe in South Portland, Maine. Many communities across the country are saving time and money by using dogs to find sources of pollution instead of gathering samples to be sent to laboratories for testing. (AP Photo/Robert F. Bukaty)

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