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 true number of fatal police shootings is surely much higher, however, because many law enforcement agencies do not report to the FBI database. Attempts by journalists to compile more complete data by collating local news reports have resulted in estimates as high as 1,000 police killings a year. There is no way to know how many victims, like Brown, were unarmed. By contrast, there were no fatal police shootings in Great Britain last year.