Do you think it should be mandatory for Police officers to wear body cameras?

The rise in police shootings over the last few years has caused many to call for increased accountability of police officers. A recent study shows that only 25% of police departments use body cams. Because they are a relatively new idea there is very little research that proves body cams are actually effective at curbing police violence and they can be expensive to implement.

The ACLU backs the expansion of body cams, but also note they could become tools for the invasion of privacy. "For the ACLU, the challenge of on-officer cameras is the tension between their potential to invade privacy and their strong benefit in promoting police accountability." They recommend the use of body cams with stringent policies as to what footage would be stored and what would be deleted.

Should body cams be implemented by all police departments, some departments, or none at all? Are they useful tools to increase transparency and protect both officers and citizens? Is the benefit of a body cam worth the investment?
https://www.aclu.org/police-body-mounted-cameras-right-policies-place-win-all