After an employee is hired, an employer learns that the employee has a significant history of violent criminal misconduct. There was no cost-effective way for the employer to have acquired this information earlier. The employer decides not to terminate the employee. Which legal risk does the employer face in this situation?

E-Verify is a system used to verify the employment eligibility of employees based on their documentation. This situation does not involve employment eligibility verification but rather focuses on the employer's knowledge of the employee's criminal history. Therefore, this choice is not relevant to the legal risks stemming from the decision to retain the employee.

Negligent hiring refers to the failure to conduct adequate background checks before hiring an employee known to have a history of misconduct. In this scenario, the employer did not have a cost-effective way to acquire the information beforehand, making this legal risk less applicable. The focus here is on retention after the fact, rather than the initial hiring process.

The WARN Act pertains to the requirement for employers to provide advance notice of mass layoffs or plant closures. This situation does not involve layoffs or closures but centers on the retention of an employee with a problematic history. Thus, this choice does not apply to the legal risks associated with the employer's decision regarding the employee.