A divided state appeals panel reversed the conviction of a defendant who illegally possessed a weapon while a gang member because prosecutors did not prove the group in question met the criteria for a gang.State law defines a gang as three or more people who essentially engage in a “course or pattern of criminal activity,” which is at least two offenses, including one felony, committed within five years of each other after Jan. 1, 1993.Prosecutors presented expert testimony about Gilbert Lozano and his alleged …