In the 1999 New York Case: BDO Seidman v. Hirschberg, 1999 N.Y. Int. 0082 (May 13, 1999) the following was noted: The modern, prevailing common law standard of reasonableness for employee agreements not to compete applies a threeâpronged test. A restraint is reasonable only if it: (1) is no greater than is required for the protection of the legitimate interest of the employer, (2) does not impose undue hardship on the employee, and (3) is not injurious to the public ( see, e.g., Technical Aid Corp. v Allen, 134 NH 1, 8, 591 A2d 262, 265â266;Blake, op. cit., at 648â649; Restatement [Second] of Contracts § 188). A violation of any prong renders the covenant invalid.