HR Internal Investigations 2026

USA Law and Practice Contributed by: Christina Hynes Mesco, Chad Ayers, Kristen Prinz and Amit Bindra, The Prinz Law Firm

6.8 Disciplinary Measures If allegations are substantiated, employers may use a range of disciplinary measures, depending on the severity of the conduct, the employee’s prior history, organisational policy and any contractual obligations. Common options include: • Spoken or written warnings: Used for lower-level or first-time misconduct; typically documented in the personnel file. • Mandatory training, coaching or counselling: Often applied in cases involving conduct, communication or judgement concerns. • Changes to duties, reporting relationships or work environment: May involve reassignment, closer supervision, or limiting contact with the reporting party. • Performance improvement plans (PIPs): Appropri - ate when the misconduct overlaps with perfor - mance or behavioural issues. • Suspension (paid or unpaid): Used when the conduct is serious or when the employer needs to reinforce the gravity of the violation. • Final written warning: Typically used before termi - nation when the employer is giving a final opportu - nity to correct behaviour. • Termination of employment: Applied in cases of severe misconduct, repeated violations, or conduct that compromises safety, integrity or legal compli - ance. Additional Considerations • Timeliness: Employers are expected to act prompt - ly once findings are reached to demonstrate that the matter is taken seriously and to mitigate risk of ongoing harm, retaliation or future allegations. • Consistency: Discipline should align with past practice and company policy; inconsistent treat - ment can lead to claims of discrimination or pretext. • Proportionality: The disciplinary action should cor - respond to the severity of the misconduct and any mitigating or aggravating factors. • Counter-allegations: If the respondent raises new claims or evidence, the employer may need to conduct a limited follow-up investigation before imposing discipline.

• Documentation: All decisions and the rationale behind them should be fully documented to sup - port the employer’s actions if later challenged. 6.9 Other Measures It is common for employers to take additional meas - ures to improve the workplace after an investigation, regardless of whether the allegations are substanti - ated. The approach varies widely by organisation, but many employers use the conclusion of an investiga - tion as an opportunity to strengthen culture, commu - nication or team dynamics. Typical actions include team-building activities, mediation between employ - ees, providing training on policies, or broader organi - sational initiatives aimed at improving culture. When allegations are not substantiated, employ - ers must take care not to implement measures in a way that suggests blame or implies that misconduct occurred. In investigations that result in unsubstanti - ated allegations, broad-based interventions such as general training or team-wide communication efforts are often preferred over individual actions. In the United States, employers are generally permitted to collect and use personal data as reasonably nec - essary to conduct an internal HR investigation, pro - vided that the collection is job-related, consistent with business necessity and limited in scope. Employers should collect only information that is relevant to the specific allegations or issues under review and should safeguard the data against unauthorised access or disclosure. Information obtained during investigations – particularly sensitive information – should typically be maintained confidentially and, when appropriate, kept separate from general personnel files. However, several important limitations apply. Federal and state laws impose heightened protections on cer - tain categories of data, including medical and mental health information (subject to the ADA and HIPAA’s minimum necessary standard), genetic information (GINA), biometric data (such as fingerprints or facial recognition, regulated under laws such as Illinois’s 7. Data Protection 7.1 Collecting Personal Data

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