Vampire Bats

In Mercier, Louisiana, the freshmen friends of the Tate University
Jason Ortiz, Aaron and Eden go to an underground party in the woods
nearby the local cemetery. They drink the punch spiced with ecstasy
and completely drugged, Jason is attacked and killed by violent bats.
When the police finds the body, they arrest Aaron and Eden as prime
suspects. However, their biology professor Maddy Rierdon sees the
corpse and advises that the youngster had been actually bitten by
animals. When Maddy catches bats using a goat and a net, she realizes
that the animals are mutant vampire bats with extra fangs and that the
modification of the breed was caused by the water dumped by Carbide
Waste Resources in the river. While a group seeks the lair of the bats
and a means to eliminate them, Maddy discloses corruption in the town.