In People v. Monahan, 25 N.Y.2d 378 (1969), a sample of defendant's blood was taken by a physician and analyzed by a laboratory assistant. The sole issue on appeal was whether the People could lay the foundation for the admission of the test results without introducing documentary proof of the rules and regulations of the police department adopted pursuant to VTL 1194 (1). The Third Department concluded that the People need not introduce such rules and regulations, provided the customary foundation for admitting scientific evidence exists. Monahan did not concern the admissibility of field tests.