Detailed Instructions: In this task, you are given a text of many news articles seperated by special token "|||||". Your task is to summarize them.
Q: The tourniquet that helped save a police officer’s life yesterday after a brazen mid-morning shooting became part of Boston cops’ everyday gear in the wake of the 2013 Boston Marathon bombings, according to authorities. 
  
 Officers rushed to the downed drug unit officer’s side yesterday after police say he was shot by Grant Headley, 27. The officer attempted to stop the bleeding using his standard-issue tourniquet, but a fellow cop took out his own and was successful, according to Boston police Commissioner William B. Evans. ||||| One of the tourniquets issued to Boston police officers after the April 15, 2013, Boston Marathon bombing that killed three and left 17 people as amputees helped save the life of a plainclothes drug officer recently after he was shot, allegedly by a convict out on probation, officials said today. 
  
 The officer, a nine-year veteran of the force assigned to a drug control unit in the city's Mattapan neighborhood, had attempted to pull over a man that Police Commissioner William Evans said "was well known to police" as a drug dealer and was driving with a suspended license. 
  
 "He is out on probation and he is out selling drugs, and that's why he was pulled over," Evans said during a news conference today at the hospital where the officer is being treated. The officer has yet to be named. 
  
 After police pulled over the suspect, Grant Headley, 27, he jumped out of the vehicle, spun around and shot the officer in the leg and ran, Evans said. Headley, who was just released from prison after serving a three-year sentence on gun and drug charges, was apprehended after a short foot pursuit, Evans said. Police recovered the weapon they believe was used in the shooting. 
  
 "The officer told me from his bedside that another officer applied a tourniquet and it stopped the bleeding," Boston Police Patrolmen's Association President Pat Rose told ABC News. 
  
 That officer was Rose's son-in-law, and the EMT who transported the shot officer was Rose's son, he said. "These are our neighborhoods." 
  
 Boston Police Department 
  
 Boston Police received 1,500 tourniquets and began training in their use in the months after two bombs were detonated along the finish line of the Boston Marathon, killing three -- including 8-year-old Martin Richard -- and wounding 260 others. 
  
 Testimony in the trial of Dzhokhar Tsarnaev detailed the makeshift tourniquets used by first responders and bystanders -- torn clothing, purse straps and belts -- to save the lives of the 17 people who would become amputees. 
  
 The officer remains in the intensive care unit at Boston Medical Center but is expected to make a full recovery, Evans said. 
  
 Mayor Martin Walsh visited the officer at the hospital and told reporters that the officers in his department are the "best in the nation. ... I commend the officers for their incredible restraint." |||||
A:
In the immediate aftermath of the 2013 Boston Marathon bombing, improvised tourniquets were credited with saving 17 lives, ABC News reports. After that, officers with the Boston Police Department were issued 1,500 tourniquets. On Friday, one of those tourniquets may have saved a veteran officer's life, according to the Boston Herald. ABC reports the plainclothes officer was shot in the leg after pulling over a suspected drug dealer with an expired license. Police Commissioner Williams Evans credits the quick reaction of other officers at the scene for what happened next, according to the Herald. "The leg was bleeding pretty good, Evans says. "They were able to quickly put that tourniquet on the officer." At the very least, the tourniquet saved the officer's leg, the Herald reports. Evans says it may very well have saved the officer's life. "We’re very fortunate that he’s not more seriously injured," he says. And Mayor Martin Walsh calls the tourniquet-applying officer a hero. The officer who was shot is still in the hospital, but he's expected to recover, according to ABC. The suspect in his shooting has been arrested.