activator - (biology) any agency bringing about activation; a molecule that increases the activity of an enzyme or a protein that increases the production of a gene product in DNA transcription. 1  substance - the real physical matter of which a person or thing consists; DNA is the substance of our genes.
In 2006, in cases where police officers intentionally fired a gun at a person, they discharged 364 bullets and hit their target 103 times, for a hit rate of 28.3 percent, according to the departmentâs Firearms Discharge Report. The police shot and killed 13 people last year. In 2005, officers fired 472 times in the same circumstances, hitting their mark 82 times, for a 17.4 percent hit rate. They shot and killed nine people that year.
The CDCâs cause-of-death data, based on death certificates collected at the state level, also reveals a profound racial disparity among the victims of police shootings. Between 1968 and 2011, black people were between two to eight times more likely to die at the hands of law enforcement than whites. Annually, over those 40 years, a black person was on average 4.2 times as likely to get shot and killed by a cop than a white person.