A student from Towamencin Township is accused of stealing a scale at North Penn High School.   18-year-old Matthew Dinenno is charged with theft and marijuana possession.   Police say school security saw him taking the scale, valued at $550, from a closet and they found it in his vehicle parked outside the school along with a small amount of marijuana.   Dinenno was arraigned before a district justice and released on $1,000 unsecured bail.