http://www.popcenter.org/problems/robbery_convenience/2Staff number
Several studies have evaluated the presence of two or more clerks to reduce the risk of robbery. The findings have been inconsistent, and are highly debated.38 The 1986 Gainesville, Fla., studies concluded that the number of clerks on duty was a strong predictor of robbery potential.39 However, a review of convenience store robberies by the National Association of Convenience Stores in 1997 did not support this conclusion.40