Workers in multiple states with multiple sick leave laws–what to do?

Q: “We have employees who work in several states. I know that some states have mandated paid sick leave. We, as a company, do not have 'sick leave' but do have vacation time. Since Oklahoma does not have this law, how should we handle those employees who live in a state that mandates paid sick leave? If, to comply with a certain state law, we must offer paid sick leave to a small number of employees, would we be required to have paid sick leave for all of them?" – Marchia, Oklahoma