Over half of dads don't spank, but those who do may be spanking because they can't cope with parenting stress, or they're abusing alcohol or drugs, according to new research led by Wayne State University professor Shawna Lee. The research, which appears in the current issue of the Journal of Interpersonal Violence, is one of the first studies to delve into corporal punishment as it relates to a father's mental health, drug and alcohol use and paternal stress