Sobriety Checkpoint When the author observed a sobriety checkpoint conducted by the Dutchess County Sheriff Department, he saw that 676 drivers were screened and 6 were arrested for driving while intoxicated. Based on those results, we can estimate that P1I2 = 0.00888, where I denotes the event of screening a driver and getting someone who is intoxicated. What does P1I2 denote, and what is its value?