No person shall loiter or prowl in a place, at a time or in a manner
not usual for law-abiding individuals under circumstances that warrant alarm
for the safety of persons or property in the vicinity. Among the circumstances
which may be considered in determining whether such alarm is warranted is
the fact that the person takes flight upon appearance of a police or peace
officer, refuses to identify himself or manifestly endeavors to conceal himself
or any object.
Unless flight by the person or other circumstances make it impracticable,
a police or peace officer shall, prior to any arrest for an offense under
this chapter, afford the person an opportunity to dispel any alarm which would
otherwise be warranted by requesting him to identify himself and explain his
presence and conduct. No person shall be convicted of an offense under this
chapter if the police or peace officer did not comply with the preceding sentence
or if it appears at trial that the explanation given by the person was true
and, if believed by the police or peace officer at the time, would have dispelled
the alarm.