If someone was taken to the hospital because they were dizzy, then we found out it was because they ate marijuana cookies, should we tell the hospital?

a 'hypothetical' person felt dizzy, disoriented, 'funny'. 911 was called. took her to the hospital. this hypothetical person had an mri, ct scan and other tests. nothing conclusive. person started feeling better. approaching the 2nd night in the hospital, the patient spoke with a friend who has a valid prescription for medical marijuana. my friend had unknowingly eaten 2 cookies full of marijuana! the hospital does not know this - yet. do we tell? I'm worried that they would then charge for all of the tests. help!! also don't want to get the fi