Use lay terms and avoid use of jargon. Unfair or deceptive acts or practices in or affecting consumer transactions are unlawful under MGL c.The law does not define any specific business actions that violate the law; rather it states that "unfair or deceptive practices" are illegal. Under Massachusetts deceptive trade practice laws a party can be held liable for three-times damages for rolling back an odometer. Section 10.02 - Unfair or Deceptive Practices: General. It shall be an unfair or deceptive act or practice, in violation of M.G.L. c. It shall be an unfair or deceptive act or practice, in violation of MGL c. 93A, § 2, for a licensee or an administrator: Massachusetts SJC Rules That Employers May Hold Employees Liable for Violating Unfair and Deceptive Trade Practices Law. Back received during the deception experiment.