but he accused officers ken cox and kimberly mcsweeney of tasing him and said they were rough surrendered at the scene. but the federal jury disagreed. >> the fair finding by the jury made it clear to the public and us that we, gratifying to know that we were recognized for their excellence. tom: the jury heard four days of testimony before reaching this decision. a family back home after a hoverboard caused a fire in their living room. their son was riding inside when the hoverboard sparked and caught fire. kelley tuthill from our sister station wcvb spoke with the fire chief and has some safety tips for riders. >> this is what' s left of a hoverboard that caught on fire while an 11-year-old boy was riding it inside his chelmsford home. 64/39.09 some extensive smoke damage throughout the house. >> it burst into flames. i hopped into flames. the door. >> extensive smoke damage, they and no one was hurt. reporter: photo show a rug and wall were damaged in the one alarm fire last night. the consumer product safety commission is investigating 40 fires nationwide sparked by lithium-ion batter