Law enforcers have the right to seize illegal items when they are legally at a location under the warrant related requirement of

I believe the answer is: plain sight

Plain sight means that the law enforcement could make the seize without conducting research to the owner's private property as long as the law enforcers see the drugs directly during their patrol.
If they want to seize the illegal objects outside their patrol, they have to get a search warrant from the government.

It is necessary for the government to force people to pay taxes - A. The public goods the government provides suffer from a  free-rider problem.

The taxes paid by taxpayers help to support common resources, such as police and firefighters, services such as roads, railways, or hospitals. Therefore, paying tax is compulsory and should be forced on people to pay.

The free-rider problem is also a problem that makes the government to enforcement of taxes on people.A free rider is a person who benefits from something without expending effort or paying for it.This is a problem that suffers the goods provided by the government.

Thus, It is necessary for the government to force people to pay taxes - A. The public goods the government provides suffer from a  free-rider problem.

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