Cocaine was apparently found "in plain sight" on the scene.

Justin Bieber's good friend, rapper Lil Za has been 'arrested for cocaine possession' after police raided the 19-year-old singer's home in Calabasas on Tuesday.

Police were searching Bieber's mansion to investigate an egg throwing incident at his next door neighbour's home.

The website reports that Lil Za once lived at Bieber's Calabasas home and has been a friend of the Canadian singer 'for years'.

The 19-year-old singer was being 'detained in his garage' while officers searched for surveillance video from his house that might shed some light on the incident, according to TMZ.

According to reports, Bieber allegedly caused more than $20,000 in damage during the vicious egg attack last Thursday.

Well, nothing about this smells like "taking the fall for a white pop star."