According to ANSI 92.24-2018, Scissor Lift trainers must be:
experienced with the particular classification of MEWP and knowledgeable regarding the laws, regulations, safe use practices, manufacturers requirements, and recognition and avoidance of hazards associated with MEWPS.
Scissor lift trainers must also be "qualified", which ANSI defines as:
A person, who, by possession of recognized degree, certificate or professional standing, or by extensive knowledge, training and experience, has successfully demonstrated his / her ability to solve or resolve problems to the subject matter, the work, or the project.