Service dogs can provide invaluable help to people who are physically or emotionally impaired, but many people use untrained pets to receive privileges they are not entitled to. 

In 12 states, misrepresenting a service animal is already illegal, and Massachusetts could become the latest state to join them, reports CBS News correspondent Don Dahler.

Christine Slavin, whose snowboarding accident in 2007 put her in a wheelchair, told CBS News impostors hurt the image of service animals. When she’s not giving ski lessons to people with disabilities, she herself is accompanied by her faithful lab and service dog, Earle. 

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