Brief video clips (from November 21, 2000) of experimental acoustic weapons and electromagnetic radiation weapons used by police. Derivative types are used by criminals with police untrained to stop their use for harassment and criminal abuse.
Here is the MA state law:
PART I. ADMINISTRATION OF THE GOVERNMENT
TITLE XX. PUBLIC SAFETY AND GOOD ORDER
CHAPTER 140. LICENSES
SALE OF FIREARMS
Chapter 140: Section 131J.
Sale or possession of electrical weapons; penalties
Section 131J. No person shall possess a portable device or weapon from which an electrical current, impulse, wave or beam may be directed, which current, impulse, wave or beam is designed to incapacitate temporarily, injure or kill, except: (1) a federal, state or municipal law enforcement officer, or member of a special reaction team in a state prison or designated special operations or tactical team in a county correctional facility, acting in the discharge of his official duties who has completed a training course approved by the secretary of public safety in the use of such a devise or weapon designed to incapacitate temporarily; or (2) a supplier of such devices or weapons designed to incapacitate temporarily, if possession of the device or weapon is necessary to the supply or sale of the device or weapon within the scope of such sale or supply enterprise. No person shall sell or offer for sale such device or weapon, except to federal, state or municipal law enforcement agencies. A device or weapon sold under this section shall include a mechanism for tracking the number of times the device or weapon has been fired. The secretary of public safety shall adopt regulations governing who may sell or offer to sell such devices or weapons in the commonwealth and governing law enforcement training on the appropriate use of portable electrical weapons.
Whoever violates this section shall be punished by a fine of not less than $500 nor more than $1,000 or by imprisonment in the house of correction for not less than 6 months nor more than 21/2 years, or by both such fine and imprisonment. A law enforcement officer may arrest without a warrant any person whom he has probable cause to believe has violated this section.