Which documents prove the Scientific Technician entry for a Petrolia applicant without a science degree?

Two things have to be evidenced: the applicant's theoretical knowledge of a listed discipline, and the presence of a professional in that discipline whom the applicant will directly support. A diploma and a technical curriculum outline address the first; an organization chart and a letter naming the supervising professional address the second.

This entry needs evidence about the workplace, not only about the applicant

Applicants using this entry usually assemble their own record thoroughly and forget the other half. On the personal side, the useful file contains the college diploma, a transcript showing the science content of the programme, any calibration or instrumentation certifications, and an employment history describing the analytical problems actually solved rather than the equipment operated. On the employer side, the letter should identify by name and credential the professional in the same discipline whom the applicant will support, describe the reporting line between them, and explain how the applicant's work feeds that professional's output.

An organization chart makes this visible in seconds. Where the American employer has no such professional on staff, this entry is not the right one, and it is better to discover that while a letter is being drafted than at a port of entry. Documents not in English require complete certified translations.