employment contracts include stipulations like not involving yourself in criminal activities and periodic checking of unreported criminal activities.

it is ABSOLUTELY not a crime for a employer to verify a employee has not broken a employment contract. it's common practice. check your employment contract. most will inform you when they are going to do a background check, but it's not a requirement.

truck drivers are EXEMPT from standard rules as your employment contracts don't have stipulations as you are interstate subcontractors.

YOU hold the liability, not the employer.

https://www.eeoc.gov/background-checks

check your regions laws, EU & UK is different, due to workers rights unions having more teeth.

au: https://www.veremark.com/blog/background-checks-in-australia-legal-requirements-processes-and-best-practices