Me. Rev. Stat. tit. 22, § 1320

Any authorized representative of the department, upon presenting the appropriate credentials to the owner or occupant, or a representative of either, may inspect any dwelling unit or child-occupied facility at reasonable times for the purpose of ascertaining the presence of lead-based substances, and may remove samples or objects necessary for laboratory analysis. Inspections may be made only when there are reasonable grounds to suspect that there are lead-based substances in or upon the exposed surfaces of any dwelling unit or child-occupied facility, or upon the request of either the owner or the occupant with whom children reside, or when a case of lead poisoning has been reported.