警務人員能否在大學校園內向任何人截停搜查?

1. Yes - Universities are not special areas that the police's authority does not apply.

2. The detail, in a simple word, is regarding the police's unreasonable detention of certain students during a visit by Chinese Prime Minister.

Based on the existing law, once the search is completed, the police has only 2 choices - either arrest or release the subject. In this case, neither happened and the students are prevented from leaving the premise.

2014-07-03 03:29:11 補充：
3. It is possible. As a way to safeguard, universities hire their own security (and of course, under the universities' rule, the security has a limited search authority, like verifying if you are a student or not). So it is rare for the police to be on campus.

4. Limited-access public area.