PEOPLE V. MENGOTE - 210 SCRA 174  

FACTS:  

Information  was  given  about  three  suspicious  looking  persons.    A surveillance  team  was  then  deployed.    Upon  seeing  that  the  men  were looking   side-by-side   and   one   holding   his   abdomen,   the   policemen approached the group and the latter tried to run away.  The suspects were then searched wherein a handgun and fan knife was seized.  It was found later on that the handgun was part of those stolen from a house wherein a robbery was staged.

HELD:  

A person may not be stopped and frisked in broad daylight on a busy street on mere unexplained suspicion.