Did not even take twenty seconds on a search to prove your wrong. There is ample evidence and numerous sources you should read.
https://www.theglobeandmail.com/news...ticle27435090/
Serial killers, when trolling for prostitutes along a red-light strip, can bereasonably assured that because of their typically transient lifestyle, thedisappearance of his victim will not be immediately deemed foul play(Sears, 1991:153).Moreover, as Sears and others note, society devalues women who sell their bodies,especially those who are poor, and in B.C. and other Canadian provinces, commonly alsoof Aboriginal background. The capture of the killer, therefore, often takes low priority,and the killer knows it. Hence, the serial killer can hunt the prostitute with relativeimpunity. F ar too often, the murders go unsolved, even unacknowledged.
https://scholar.uwindsor.ca/cgi/view...66&context=etd