Title VII reaches the substance of a selection procedure through the Uniform Guidelines on Employee Selection Procedures, adopted in 1978 and codified at 29 CFR part 1607, which provide that use of any procedure with an adverse impact on the employment opportunities of a race, sex, or ethnic group is discriminatory unless the procedure has been validated in accordance with the Guidelines [4][6].
How the four-fifths rule works
The threshold is a rule of thumb rather than a definition of illegality. A selection rate for any race, sex, or ethnic group that is less than four-fifths, or eighty percent, of the rate for the highest group is generally regarded by the federal enforcement agencies as evidence of adverse impact [5]. Smaller differences may still count where they are statistically significant, and larger ones may not on small samples [5]. Once adverse impact appears, the burden is to show the procedure is job related and consistent with business necessity, which the EEOC describes as necessary to the safe and efficient performance of the job, and where two procedures are substantially equally valid the Guidelines direct you to the one with the lesser adverse impact [4][6].
Criminal records specifically
The EEOC's April 2012 enforcement guidance separates arrests from convictions. An arrest does not establish that criminal conduct occurred, so it alone cannot justify exclusion, though the underlying conduct may be examined where relevant to the job [7]. For convictions the guidance applies the Green factors: the nature and gravity of the offense, the time passed since it or the sentence ended, and the nature of the job sought [7]. Blanket exclusions covering every conviction across every position are the pattern most exposed under that guidance [7].
What changed in federal enforcement during 2026
The Department of Justice's Office of Legal Counsel issued an opinion on June 9, 2026 concluding that the EEOC's Title VII disparate-impact guidelines are inconsistent with Title VII and the Constitution, because they impose liability for disproportionate effects without regard to an employer's likely intent; the opinion also treats facially neutral tools such as background checks and aptitude tests as presumptively job related [8][9].
That is a shift in enforcement posture, not a repeal. The Uniform Guidelines remain in the Code of Federal Regulations, the 2012 guidance remains posted without a rescission banner [7], and disparate-impact claims remain available to private litigants and under many state statutes [8]. Confirm the current federal position with counsel before changing a program built on the four-fifths analysis.