Charlotte killings highlight the risks police face when serving warrants

Arrest warrants must be served to alleged criminals if society is going to function. But there is no guarantee of safety for police officers knocking on their doors.

The grim risks came into stark relief Monday when four law enforcement officers were killed in North Carolina while serving an arrest warrant. The attack in Charlotte left four other officers wounded and became the worst attack on police in the U.S. since 2016.

The tragedy underscores the limits of even the best-trained...