The 2 police shootings this week revealed the 'biggest issue' facing police departments today
Alton Sterling shooting
Alton Sterling shooting

(Alton Sterling.Screenshot via The Advocate)

The world watched two black men in two different US cities die at the hands of police this week.

In the first incident, an anonymous bystander filmed two Louisiana police officers find a gun in the pocket of 37-year-old Alton Sterling and then shoot him in the chest while he was pinned to the ground.

Another graphic video, shot by the owner of the store where the incident occurred, later emerged.

The next night, Philando Castile's girlfriend recorded a live Facebook video of the aftermath of a traffic stop that ended with a Minnesota police officer firing multiple shots into Castile's arm.

While police and state officials haven't confirmed many details, Castile reportedly informed the officer of his concealed weapon (for which he had a permit) and simply reached for identification, as instructed. The 32-year-old school-cafeteria worker died later that night at a local hospital.

Both incidents have fanned the flames of a national debate about the use of force and apparent racial bias in policing and prompted renewed calls for better policies. In an interview with CNN Friday afternoon, presumptive Democratic presidential nominee Hillary Clinton hinted at her plan for greater standardization in policing.

"As president, I would implement the very comprehensive set of proposals that I've been making for more than a year, including we must do more to have national guidelines about the use of force by police, especially deadly force," she said. "We need to do more to look into implicit bias. And we need to do more to respect and protect our police."

According to many experts, however, a general lack of effective training and uniformity within that training, acts as a significant block to a more peaceful future.

In fact, it's the "biggest issue" facing police departments today, Chuck Drago, a former police chief in Florida with over 30 years of experience, told Business Insider.

baton rouge
baton rouge

(A demonstrator protesting the shooting death of Alton Sterling is detained by law enforcement near the headquarters of the Baton Rouge Police Department in Baton Rouge, Louisiana, July 9, 2016.Jonathan Bachman/Reuters)

Lower levels of force

No national standards exist for the use of force, or other policing tactics, for that matter. Pulling from various Supreme Court cases, an officer is legally justified using lethal force if the officer reasonably and objectively fears the person will cause death or serious injury to the officer, other officers, or the public.

"I think that officers are trained with the mentality that, 'Oh, if it’s reasonable, I can shoot.' It's a bad mentality," said Drago, who now acts as a consultant for various law-enforcement groups.