Please check my answer thanks.

Dr Johnson is treating a psychotic drug user. The patient suddenly leaves the facility, leaving a note that he plans to kill his ex-wife. The pt left behind his antipsychotic meds that he must take every two hours Dr Johnson...
1. MAy not release this info because it's confidential.\
2. may release the info
3. may relase the info if the pt authorized such release in advance
4. may release ifo after obtaing a court order first

I picked # 2 because the pt may hurt someone

I would agree, but it may vary in some states. To make sure, I searched Google under the key words "confidential info danger psychologist" to get these possible sources:

http://books.google.com/books?id=9fP3X_ciUOQC&pg=PA133&lpg=PA133&dq=confidential+info+danger+psychologist&source=web&ots=ztKSgiBVXD&sig=u5WD80zN1x4dvyMXL_rHSf6AJwo#PPA133,M1
(See page 133)
http://depts.drew.edu/counsel/Privacy_Practices.html
http://halifaxpsychologist.com/seepsychologist/index.html
http://www.azpa.org/displaycommon.cfm?an=2

In the future, you can find the information you desire more quickly, if you use appropriate key words to do your own search.

I hope this helps. Thanks for asking.