US: Title VII and the 4/5ths rule
In the United States, Title VII of the Civil Rights Act of 1964 and the Equal Employment Opportunity Commission guidelines govern pre-employment testing. Tests cannot produce disparate impact on protected groups unless the employer can demonstrate the test is job-related and consistent with business necessity.
The 4/5ths rule is the practical threshold. The selection rate for any protected group must be at least 80 percent of the rate for the highest-selected group. Tests that produce selection rates below this threshold trigger regulatory scrutiny.
Major cognitive test vendors publish validation studies and fairness analyses specifically to document compliance with these requirements. Employers using validated tests generally operate within the legal framework as long as they apply the test consistently.
UK: Equality Act 2010
The Equality Act 2010 in the UK provides similar protections. Tests must be relevant to the role, free of direct and indirect discrimination, and administered with reasonable accommodations for disabilities.
Indirect discrimination is a specific concern for language-dense tests like Watson-Glaser or verbal reasoning assessments, where non-native English speakers may be disadvantaged. Employers using these tests are expected to consider whether the language demand is genuinely necessary for the role.
EU: GDPR and automated decision-making
In the European Union, GDPR includes provisions specifically around automated decision-making, which includes algorithmic scoring of cognitive tests. Candidates have rights to transparency about how their data is processed and how decisions are made.
Article 22 of GDPR gives candidates the right not to be subject to decisions based solely on automated processing. In practice, this means most employers using algorithmic scoring must have human review as part of the final decision, even if the test score is the primary filter.
Reasonable accommodations
Employers must provide reasonable accommodations for candidates with documented disabilities. Common accommodations for cognitive tests include extra time (typically 25 to 50 percent more), larger fonts, screen readers, assistive software, and quiet testing environments.
Accommodations must be requested through HR before the test is scheduled, not at the test itself. You will generally need documentation from a qualified professional such as a doctor or educational psychologist. The employer cannot ask for details about the underlying condition beyond what is necessary to evaluate the accommodation request.
AI proctoring and biometric data
AI proctoring is generally legal in most jurisdictions but is subject to specific regulations in some. New York City, Illinois, and several EU member states have laws requiring explicit disclosure and consent before biometric data such as facial recognition is collected during a test.
If you have concerns about AI proctoring, ask the employer about alternatives before the test starts. Some will accommodate live human proctoring on request. Many will not.
What to do if you suspect unfair testing
Document everything. Note the test name, vendor, date, time, and any circumstances that concerned you. Keep emails from the employer. If you believe the test produced unfair treatment, contact an employment lawyer rather than attempting to negotiate directly with the employer.
Many cases settle quietly because neither the employer nor the candidate wants publicity. Early legal consultation is usually free and can establish whether you have a substantive case before you invest in pursuit.