This statement is true. The and operator will check both conditions - so if you write Brad Pitt AND Angelina Jolie, it means that the browser will check for both of those conditions. On the other hand, the andalso operator does not necessarily evaluate the second condition, so if you wrote the same think (using andalso operator), the browser may focus only on the first condition, which is Brad Pitt in this case.
Under no means should a teacher need to carry a gun. It is already illegal in many states to possess a gun within more than 1000+ ft. from any school. The thought of being safe or cautious is factored out because in turn they too are now deemed unsafe. It clearly violates the 'Gun-free Zone' policy.