Patrol cannot search you without a valid reason.
Depending on the resort, location, how its owned etc..
If they have a reason.. they can ask to see the contents in a bag if they feel it has the potential to put other guests safety at risk.
IE. They saw you drinking, and saw a bottle get placed back in the bag, they can ask to search and if you refuse escourt you off the mountain and contact the police.
Its because if you hurt yourself or others and it goes to court and you say "Well yes I was drinking, but the patrol saw me and did nothing. Thats why I ran into some guy." the judge will say "Well the fault is at the resorts level as they failed to attempt to remove the guest from the property."
Same thing goes if they see you with drugs.
Don't quote me on any of this, I'm just going on what I know from the resort I work at haha.