Riverdale Mills Corp. makes plastic-coated steel wire products in Northbridge, Massachusetts. Riverdale uses a water-based cleaning process that generates acidic and alkaline wastewater. To meet federal clean-water requirements, Riverdale has a system within its plant to treat the water. It then flows through a pipe that opens into a manhole-covered test pit outside the plant in full view of Riverdale’s employees. Three hundred feet away, the pipe merges into the public sewer system. In October 1997, the U.S. Environmental Protection Agency (EPA) sent Justin Pimpare and Daniel Granz to inspect the plant. Without a search warrant and without Riverdale’s express consent, the agents took samples from the test pit. Based on the samples, Riverdale and James Knott, the company’s owner, were charged with criminal violations of the federal Clean Water Act. The defendants filed a suit in a federal district court against the EPA agents and others, alleging violations of the Fourth Amendment. What right does the Fourth Amendment provide in this context? This right is based on a “reasonable expectation of privacy.” Should the agents be held liable? Why or why not?