Pennsylvania State Police is adding patrols in Beaver, Lawerence, Mercer and Butler counties this holiday season.  Increased patrols are starting midnight Friday and go until midnight Monday.  Last year, there were nearly 50 crashes during the four days surrounding Christmas.  Nearly ten-percent were alcohol-related, and one resulted in a death.  More than 550 citations were handed out in 2015, including 19 drivers arrested on suspicion of DUI.