Here is what the Maryland Division of Occupational and Professional Licensing has to say:
The federal Pre-Renovation Lead Information Rule, also known as section 406(b) of the Toxic Substances Control Act, requires people performing renovation for compensation in a pre-1978 home to distribute a lead hazard information pamphlet prior to commencing the renovation.
Although Maryland lead law does not cover contractors doing maintenance or renovation work in an owner occupied pre-1978 dwelling unit, the contractors need to exercise safe lead work practices since they can generate lead contaminated dust. The contractor whose work causes lead poisoning may not be subject to enforcement action by MDE, but he/she may be judged as liable in a lawsuit for damages to the health of any person poisoned in the dwelling unit.
Good luck!