HADLEY — Potentially hazardous chemicals missing or moved from a 108 Hockanum Road home, following a raid at the residence by Federal Bureau of Investigation agents on April 8, has prompted the temporary detention of resident Jacob D. Miller.

Miller, who was arrested April 9 on charges of unlawful possession of firearms and ammunition, was taken into custody on Thursday by U.S. marshals and was held over the weekend. A detention hearing was set for Tuesday at 1 p.m. in Franklin Courtroom in U.S. District Court in Springfield before Magistrate Judge Katherine A. Robertson.

The detention of Miller came after he had previously been released on conditions, with a special condition that he consent to allow the state Department of Environmental Protection to enter his residence and remove any hazardous materials.

According to the criminal complaint affidavit from Derek Boucher, an FBI special agent, personnel with MassDEP identified several possibly missing items from Miller’s home, including potassium chlorate, which is a precursor chemical that can be used to manufacture explosives; chemicals identified as UN 1956, UN 1393 and UN 1400; a cobalt metal broken cathode; a small vial of yttrbium; a small cube of lutetium, or lu; rhenium; nickel foam; a vial of sodium; and a silver-dollar size cobalt pillar.

“The FBI’s investigation into this matter, including the extent to which Miller may have removed hazardous substances after the execution of the search warrant on April 8, 2025 and/or after the initial appearance on April 9, 2025, is ongoing,” the complaint reads.

Another area of concern noted in the complaint is that Miller told investigators that no mercury was present in the home, yet they found a 40-pound container of liquid mercury. The complaint notes that mercury is highly toxic and even small amounts of mercury can cause heavy metal poisoning.

While MassDEP personnel attempted to remove the items from the home, Miller objected, telling them that the chemical supplies are for his business and that “he was a chemist and knew how to handle them.”

The criminal charges against Miller are based on his possession of weapons and ammunition, in violation of Title 18, Section 922(g)(1) of the U.S. code, which states that it is unlawful, due to a previous criminal conviction with a sentence of more than one year “to ship or transport in interstate or foreign commerce … any firearm or ammunition; or to receive any firearm or ammunition which has been shipped or transported in interstate or foreign commerce.” Miller was convicted in 2004 on charges of possession of explosive devices and possession of child pornography.

When FBI agents opened a safe in Miller’s home last week, they found a Remington Model 514; a J. Stevens Arms Company Single Gun; a Remington Sportsmaster Model 511; an O.F. Mossberg & Sons No. 44B; a Marlin Family Firearms Company; and a Remington Model 12C .22 rifle.

In a bedside stand they found a box of 50 rounds of Federal brand, American Eagle, .45 auto, 230 grain ammunition, determined to be ammunition not manufactured in Massachusetts, according to the FBI.

The charge of unlawful possession of ammunition and firearms provides for a sentence of up to 15 years in prison, three years of supervised release and a fine of up to $250,000. Sentences are imposed by a federal district court judge based upon the U.S. Sentencing Guidelines and statutes which govern the determination of a sentence in a criminal case.

Scott Merzbach can be reached at smerzbach@gazettenet.com.