Can you be arrested for it? Absolutely, but that doesn't mean much. Just like you can sue someone because you don't like the way they look, it will be thrown out of court or in your case, the prosecutor while tell the cops to pound sand.. Owning a light is not a crime in America.
Do yourself a favor and research your city/county/state laws and read up on YOUR marijuana law. Easy enough to do, google "My County laws" or "My State laws"and you will find a database. Search in that for marijuana. Check out norml.org too.
As far as searching your house, the Police only need permission from ONE adult residing there. Do you have your crazy ex-brother-in-law who thinks he can fly living in your basement closet for a month? He can give police consent to search. Be careful whom you invite to live with you.
Finally, unless you are very desperate and cannot find another mate, please split-up, divorce, move out, or do whatever you need to do, but this is not a person who cares about you. Save the heat of the moment BS, they tried to have you incarcerated for a good long while. This is not a person who cares about you.