Multiple attacks on officers this week illustrate the inherent dangers of traffic stops

At least four law enforcement officers were seriously injured during traffic stops across America over the last week -- three by gunfire -- leading to the death of one sheriff's deputy. Law enforcement experts say the attacks highlight the risks inherent to the job of policing, even if they aren't evidence of a growing trend.

A motorist dragged a Philadelphia police officer for five blocks while attempting to flee after the officer spotted a gun in the car. A man pulled over by a Houston-area deputy over the weekend shot the deputy to death. A man emerged from a garbage can and shot a Milwaukee County sheriff's deputy during a search for someone who fled a traffic stop. In Georgia, a sheriff's deputy was shot in the chest during a stop -- their vest stopped the round.