WA police have arrested a woman for possessing a marijuana bong made out of a baby's bottle and emblazoned with a swastika.

The discovery was made when police arrived at a Banksia Grove home on Sunday evening to investigate an "unrelated matter".

A woman in her mid-30s has been arrested.

The Swastika-emblazoned baby bottle bong. Source: Wanneroo Police. More

Wanneroo Police senior sergeant Simon Hazel admitted the "Nazi" bottle bong was "certainly not something we see every day."

"With anyone who has substance abuse issues, they do anything to satisfy their addiction," Mr Hazell said.

"They turn everything into a smoking implement. It doesn't surprise us."

Facebook users have since posted some facetious comments online.

"Hi guys, will this be available at the next police auction?", one person wrote.

Another asked if the baby had also been arrested.