More precisely, there is no question of becoming a full member.

The employer of the labor dispatch workers is the labor dispatch company, that is, the labor dispatch workers are not employees of the IRS at all, but employees of the labor dispatch company. There is a labor relationship between labor dispatch workers and labor dispatch companies, but there is no employment relationship between labor dispatch workers and IRS.

The staff of the IRS belong to the national civil servants. Civil servants must pass the national civil service examination before they can be hired, that is, they must take the examination before they can be promoted. Therefore, labor dispatch workers can only enter the civil service sequence by taking the civil service examination, and there is no possibility of becoming a full member.