Mr. Metzger has authored several amicus curiae (friend-of-the-court) briefs on behalf of public health organizations, physicians and scientists regarding various toxic chemicals and chemically-induced diseases, as well as various legal issues, including the admissibility of expert testimony regarding medical causation in toxic tort cases.  These briefs have been submitted to state supreme courts, federal appeals courts, and the United States Supreme Court in important toxic tort cases, some of which briefs have been cited by these courts in deciding the cases.

Dow Chemical Co. v. Stephenson (2003) 539 U.S. 111, 123 S. Ct. 2161, 156 L. Ed. 2d 106

Amicus Curiae Brief of the Lymphoma Foundation of America and physicians and scientists in support of Vietnam Veterans (science/medicine brief regarding the causal link between exposure to Agent Orange and the development of various lymphopoietic malignancies)

In re “Agent Orange” Product Liability Litigation (2^nd Cir. 2008) 517 F.3d 76

Amicus Curiae Brief of the Lymphoma Foundation of America, the Council for Education and Research on Toxics, and physicians and scientists in support of injured Vietnam Veterans

In re “Lockheed Litigation Cases” (Cal. Supreme Court Case No. S 132167), petition for review granted, 110 P.3d 289 (Cal. 2005), petition for review dismissed, 83 Cal. Rptr. 3d 478 (2007)

Amicus Curiae Brief of the Council for Education and Research on Toxics in support of the appellants (regarding the admissibility of expert testimony on causation under California law)

Milward v. Acuity Specialty Products Group, Inc., U.S.C.A. 1^st Cir., Case No. 09-2270

Amicus Curiae Brief of the Council for Education and Research on Toxics and scientists and physicians in support of the plaintiff/appellant (science/medicine brief regarding benzene as a cause of acute promyelocytic leukemia and admissibility of expert testimony regarding such)

Parker v. Mobil Oil Corporation (2006) 7 N.Y.3d 434, 857 N.E.2d 1114, 824 N.Y.S.2d 584 Amicus Curiae Brief of the Council for Education and Research on Toxics and scientists and physicians in support of the plaintiff/appellant (science and medicine brief regarding the dosimetry of benzene-induced leukemia cited in the opinion of the Court of Appeals of N.Y.)