2. This amendment to the city's building safety code is

Congressional hearings determined that the use of mechanical power hammers is very dangerous to the persons using them and to persons in the vicinity of the persons using them. As a result, Congress enacted a statute prohibiting the use of mechanical power hammers on all construction projects in the United States. Subsequently, a study conducted by a private research firm concluded that nails driven by mechanical power hammers have longer-lasting joining power than hand-driven nails. After learning about this study, a city council enacted an amendment to its building safety code requiring the use of mechanical power hammers in the construction of all buildings intended for human habitation.

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