it has had many critics, including Justice Thurgood Marshall who argued for a "spectrum of standards in reviewing discrimination", instead of discrete tiers. Justice John Paul Stevens argued for only one level of scrutiny, given that "there is only one Equal Protection Clause". The whole tiered strategy developed by the Court is meant to reconcile the principle of equal protection with the reality that most laws necessarily discriminate in some way. Choosing the standard of scrutiny can determine the outcome of a case, and the strict scrutiny standard is often described as "strict in theory and fatal in fact". In order to select the correct level of scrutiny, Justice Antonin Scalia urged the Court to identify rights as "fundamental" or identify classes as "suspect" by analyzing what was understood when the Equal Protection Clause was adopted, instead of based upon more subjective factors. Discriminatory intent and disparate impact Because inequalities can be caused either intentionally or unintentionally, the Supreme Court has decided that the Equal Protection Clause itself does not forbid governmental policies that unintentionally lead to racial disparities, though Congress may have some power under other clauses of the Constitution to address unintentional disparate impacts. This subject was addressed in the seminal case of Arlington Heights v. Metropolitan Housing Corp. (1977). In that case, the plaintiff, a housing developer, sued a city in the suburbs of Chicago that had refused to re-zone a plot of land on which the plaintiff intended to build low-income, racially integrated housing. On the face, there was no clear evidence of racially discriminatory intent on the part of Arlington Heights's planning commission. The result was racially disparate, however, since the refusal supposedly prevented mostly African-Americans and Hispanics from moving in. Justice Lewis Powell, writing for the Court, stated, "Proof of racially discriminatory intent or purpose is required to show a violation of the Equal Protection Clause." Disparate impact merely has an evidentiary value; absent a "stark" pattern, "impact is not determinative." The result in Arlington Heights was similar to that in Washington v. Davis (1976), and has been defended on the basis that the Equal Protection Clause was not designed to guarantee equal outcomes, but rather equal opportunities; if a legislature wants to correct unintentional but racially disparate effects, it may be able to do so through further legislation. It is possible for a discriminating state to hide its true intention, and one possible