Final answer:
A licensee may only contact a previous customer if there is an established business relationship and the customer has not requested to be placed on the do not call list.
Step-by-step explanation:
Under the do not call laws, a licensee may only contact a previous customer if there is an established business relationship with the customer. This means that if the customer has made a recent inquiry or purchase, the licensee may contact them within a certain time frame. However, if the customer has specifically requested to be placed on the do not call list, the licensee cannot contact them.