Prohibited Interview Questions: Why Interviews Carry More Risk Than You Think

Hiring may seem like a straightforward process, but interviews can create compliance risks when questions drift into personal or legally protected areas. In this month’s Workplace Update, The Workplace Advisors explain why employers should approach interviews with structure, consistency, and job-related questions to help reduce legal exposure and support stronger hiring decisions.

The interview may seem like an informal chat, a way to get to know each candidate beyond their résumé. And to some extent, it is. But it is also one of the most high-risk, compliance-sensitive phases of the hiring process. A single poorly worded question can create significant legal exposure for the organization.

Often, these questions arise from good intentions in an attempt to build rapport, keep the conversation relaxed, or ease a candidate’s nervousness. But when casual conversation drifts into personal territory, it can quickly touch on characteristics that are legally protected and unrelated to the role. 

The Legal Landscape

A wide range of federal, state, and local laws dictate what employers may ask during the hiring process. Taken together, they protect candidates from questions that could reveal, or that appear designed to reveal personal characteristics unrelated to job performance. At the federal level, protected categories include race, color, religion, sex, gender identity, national origin, age, disability, genetic information, and military or veteran status, among others. State and local laws often expand these protections, covering areas such as criminal history, salary history, and additional categories that vary by jurisdiction. 

Interview questions must never directly or indirectly probe into these areas. Even questions that seem casual or well intentioned: those about a candidate’s family, hometown, or personal beliefs, can overlap with protected categories and be interpreted as evidence of discriminatory intent. 

The clearest rule: if a question does not directly relate to a candidate’s ability to perform the essential functions of the role, it should not be asked. 

Disability and Medical Inquiries: Prior to a conditional offer, employers may not ask about a candidate’s disability or medical history, even when a condition is visible. Interviewers should describe the essential functions of the job and ask whether the candidate can perform them, with or without reasonable accommodation. After a conditional offer has been made, disability-related questions and medical exams are permitted, provided they are applied consistently to all candidates in the same job category. Once employment begins, such inquiries are permitted only when job-related and consistent with business necessity. Employers are also prohibited from asking about genetic information or family medical history, including mental health history or genetic testing. If the question is not relevant to the job, it isn’t a question that belongs in the interview. 

Common Mistakes

Most compliance violations in interviews don’t come from bad intent. Instead, they come from bad habits and patterns that create risk. These include:

• Rapport-building that goes too far. Asking “Where are you from originally?” or “Do you have kids?” feels friendly, but both questions touch protected categories. 
• Assumptions based on appearance. Commenting on or asking about a visible condition, accent, apparent age, or physical trait, even with good intentions, can be interpreted as discriminatory. 
• Engaging with volunteered personal information. When a candidate shares personal details unprompted, interviewers sometimes ask follow up questions that can compound the exposure. Acknowledge and redirect. 
• Off-script small talk. Unstructured time before or after the formal interview is where many violations occur. Legal exposure doesn’t pause because the formal interview hasn’t yet started. 

Questions to Avoid and What to Ask Instead

Any question that could reveal a protected characteristic, directly or indirectly, should not be asked. The most common problem categories and permitted alternatives follow.

Avoid:

• Age, year of graduation, or retirement plans
• Marital status, family plans, or living arrangements
• National origin, ancestry, race, or anything that implies where someone’s family is from
• Religion, gender identity, or sexual orientation
• Physical traits, medical history, disability status, or workers’ compensation
• Substance use habits, union membership, or military veteran status/discharge type

When presented appropriately, you can ask:

• What is your name?
• What is your address?
• Are there any factors that would make it difficult for you to work the required schedule?
• What educational institutions did you attend, and what degrees or certifications did you earn? (Avoid asking for dates of completion.)
• Are you legally authorized to work in the United States?
• What languages are you fluent in (speaking, reading, and writing)?
• Are you able to perform the essential functions of the position, with or without reasonable accommodation?
• Are you over 18 years of age?
• Are you a military veteran?
• What military skills or experience are you able to bring to this position?
• This position requires a security clearance and/or a clean criminal background. Do you anticipate any issues meeting this requirement?

Building a Solid Interview Process

Start with structure: A structured interview, one where every candidate is asked the same predetermined, job-relevant questions in the same order, is an extremely effective tool for keeping the process both compliant and defensible. When interviewers go off script, risk and exposure go up. When they follow a consistent format, it becomes much easier to compare candidates fairly, support hiring decisions, and demonstrate that the process was free from bias. 

Use Behavioral Questions: Behavioral questions anchor the conversation to job performance rather than personal characteristics. Past behavior is the best available predictor of future performance. Possible behavioral prompts include:

• “Tell me about a time you had to manage competing deadlines.”
• “Describe a situation where you had to resolve a difficult customer issue.”
• “Give an example of how you handled a challenge while working as part of a team.”

This approach also reduces unconscious bias: when every candidate answers the same questions, evaluators are comparing performance on a level playing field rather than reacting to personal impressions.

The Rule of Thirds: This candidate evaluation framework weighs three inputs equally: experience and background, behavioral assessment data, and soft skills; how the candidate communicates, fits within the team, and shows up in the room.

The Role of Assessments: Behavioral assessments are not a replacement for an interview; they are a validation tool. When used alongside structured interviews, assessments help confirm what you’re observing in conversation, surface patterns that a single conversation might miss, and reduce the risk of decisions driven by first impressions. The interview is one data point and the assessment is another. Together, they provide a more thorough and more defensible picture of the candidate. 

The Goal: A Process Worth Defending

Compliance and candidate quality are not mutually exclusive; they reinforce each other. An interview process built on consistent, job-relevant questions, behavioral prompts, and objective evaluation tools is not just legally defensible. It is also more likely to uncover the right candidate. 

The organizations that get this right don’t simply avoid bad questions. They build a process so clear and well-structured that good questions are the only ones anyone thinks to ask.