'
I'll say it again for you, 
…they, meaning hotel owners, which is the subject being discussed, can't effectively prohibit what's legal.
.
And simple possession of small amounts of pot is legal.  

They can post a sign saying zero tolerance, but it carries no weight in regards to simple possession of small legal amounts of pot.

.

And, though you might have questions, it's pretty clear to pot smokers that a hotel is not a school,

...and no one here was talking about open carry in a courthouse or anywhere else.
.
.
How to resist Trump, …something for everybody,  …practical actions everyone can join in on.

Complete and comprehensive manual available here:

https://docs.google.com/document/d/1DzOz3Y6D8g_MNXHNMJYAz1b41_cn535aU5UsN7Lj8X8/preview#

'