No. I have been through the exact same situation. Exept the cops were at my neighbours house and when i stepped out to see what was going on and argue in defence of my neighbour, one officer came to my front door and saw my bong that was clearly visible. Long story short he ended up taking it (no marijuana in the house). I took him to court and i won the case. I live in Ontario, Canada so i dont know what the laws are for other places of the world but i had the option to actually sue the officer to trespassing without a warrent. But i didn't. So i urge you to fight this case. You will win.