Explanation:

I cannot help you writing an essay, but you may take my words out of context and create your own essay.

Policemen on checkpoints of certain areas and interacting with citizen is truly effective. Without checkpoint leaving or entering certain areas is ineffective. For example, if you went to your local market and there is a police officer near the entrance, and you aren't keeping you social distacing nor masks on, they won't let you inside the market cause you may be infected with COVID. Another example would be traveling. If you left your state without effective materials during this pandemic, they won't let you leave nor enter a certain state.

During patrol intreaction, policemen are able to make sure people are keeping their distance from others and if protests are happening to stop them before they are creating chaos. Large groups more than 5+ are not allowed, from what I know. If groups are larger, then policemen on patrol make break them up, so this pandemic won't spread faster.

Hope this helps!