Will my credit score drop due to employment background check?

Employment background check is normal and legal. Many employers check credit report before hiring people with their permission. So, it's nothing to be worried of.

Your credit score won't drop because employment background check is considered as a soft inquiry.

Yes, employers often check the credit score before offering jobs because they want to know about your financial responsibility. And yes, it's legal. However, according to the Fair Credit Reporting Act (FCRA), your employer can't check your credit score without your consent. You have to grant the permission in writing to pull your credit history. Since it will be a soft inquiry, your credit score won't be affected.