Beatrice, Neb., dispatcher Chandra Crooks quickly realized a 9-1-1 caller could not speak but was able to communicate with the woman by having her answer yes and no questions using a designated number of knocks. The call came from a cellphone so Crooks could not trace the exact address. She was able to locate the woman by learning from the knocks that she lived in an apartment building and she realized the dog the police officers heard barking was the same she heard over the phone.

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