While Justin Bieber's mansion was raided, following the egg-throwing incident, drugs and illegal substances were scattered everywhere.

However, it wasn't the 19 year-old who got arrested, it was his good friend Lil Za, who was detained for possessing the ecstasy drug MDMA.

So how did two dozen police officer and detectives miss the 'Love Me' singer's stash of drugs?

TMZ reports, there were two very large "cookie jars" filled to the brim with weed and were in open view of the law enforcers.

The gossip site also claims there were four to five empty bottles of codeine, along with empty Fanta bottles, which are mixed to create the drug beverage 'sizzup', or as it is known to most users, 'Lean'.

Evidence that these narcotics were being used was also in clear view as detectives could see three bongs around the ground floor of the party house, two in the kitchen and one in the front room.

Allegedly, the reason why police didn't arrest Justin, there and then, is because that was not the main priority or reason of their visit.

They raided the house with a warrant that only permitted them one objective, to find video equipment and footage connected to the surveillance which could provide evidence of what actually occurred when Bieber reportedly threw eggs at his neighbors house.

This past Thursday (Jan 16th), Lt. David Thompson, the lead detective on the case, told the NY Daily News, "It's pretty widely known the kid smokes weed."

"We're not doing some big sting on Justin Bieber," Thompson continued. "We didn't go opening containers and pulling out drawers. This was about the egging."

"It was right in our face," he concluded.

These claims come after it was heavily reported that Bieber is a regular drug taker and is developing an addiction to codeine, with his favourite being 'Actavis Prometh', a prescription-strength cough syrup that contains codeine, and costs around $800 for a full pint.

Justin Bieber
Bieber's house is reportedly full of drugs