Even though cannabis use is legal in some states it may not be allowed on the campus college in those states because

Even though cannabis use is legal in some states, it may not be allowed on a college campus in those states because:

They are religious institutions  

They receive federal funding  

They have students under age 18

They have lobbied to be exempt to protect students

They receive federal funding  

Explanation:

The reason why some states may not allow the use of cannabis on campus colleges even if those states have legalized the use of cannabis is that those campus colleges receive federal funding.

Cannabis is not legal in federal law so because the schools are federally funded, the use of cannabis there is illegal.

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