Causes of Erectile Dysfunction. Erectile dysfunction (ED) occurs when a man is unable to get or sustain an erection firm enough for sexual intercourse. Intermittent ED is common. Many men experience occasional ED. It is generally caused by stress, exhaustion, or similar causes.
State Firearm Background Checks: NICS Data. Federal firearm background checks are conducted using the FBI's National Instant Criminal Background Check System (NICS) to ensure transactions do not violate federal or state laws. Total federal firearm background checks climbed to a record high 23.1 million in 2015, up 10 percent from 2014. While background check statistics are commonly used to approximate firearm purchases, they do not represent actual numbers of guns sold.
Department of Defense labs tests 60,000 urine random samples each month. All active duty members must undergo a urinalysis at least once per year. Members of the Guard and Reserves must be tested at least once every two years. There are several protections built-in to the system to ensure accurate results.