Maryland Statutes
Subtitle 3 - Records
Section 12.5-301 - Information Required on Invoice

Each licensed locksmith shall include on each invoice or receipt for services the following information regarding each service call:
        (1)    the address where the services were provided by the locksmith;
        (2)    the type of lock being serviced;
        (3)    the vehicle identification number, if applicable;
        (4)    the quoted cost of the service provided to the customer prior to agreeing to provide the service; and
        (5)    the actual cost of the service paid by the customer.