This video investigates the use of "drop weapons" in Iraq by US soldiers. The US soldiers carry around AK-47s to "drop" on Iraqis that are killed accidentally.
Watch as the soldiers struggle with their conscience in describing the process. You can see the torment it causes as the soldiers begin to realize the US military is not as honorable and noble as they thought.
Many US police officers are former US military. If police are found planting weapons on civilians it should come as no surprise.
This is one of many reasons why I will instruct my children to never join a government military. Never. You are fighting for the government - not for the citizens. The government military will devour your soul.