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Equal protection is a
constitutional law doctrine that stems from the clause in the 14th amendment that prohibits states from denying people “equal protection” under
the law. Though the 14th amendment, by its terms, applies only to
the states, the equal protection clause has been applied to the federal
government as well, through the “due process” clause of the Fifth Amendment.
The equal protection clause
prohibits the government from discriminating between classes without adequate
justification. Discrimination on bases that the courts consider “non-suspect”
such as age, wealth and income, are typically allowed as long as they are
rationally related to legitimate government interests. Other categories of
discrimination, such as those based on gender, race or national origin, are
considered “quasi-suspect” or “suspect” classifications and are subjected to
much higher levels of scrutiny by courts. In such cases, the burden of proof is
on the government to show important justifications for discriminatory rules to
be allowed to stand.