The use of scientific research to promote one's own cause inappropriately is described as

Junk science is the inappropriate use of scientific-looking claims to advance one's own cause or agenda.

Improper science is not the accepted technical term for this misuse.

Unscience is not a recognised category in research methodology.

Routine science refers to ordinary normal enquiry, not deliberate distortion.

Such distortion typically cherry-picks favourable data and ignores contrary evidence.

Pseudoscience similarly imitates science without its rigorous method.