the subject matter waiver doctrine does not extend to materials protected by the opinion work product privilege." Cox, 17 F.3d at 1422, citing In re Martin Marietta Corp., 856 F.2d 619, 625- 26 (4th Cir. 1988). Petitioners have not identified any documents, for which the government invoked privileges, and for which t

the subject matter waiver doctrine does not extend to materials protected by the opinion work product privilege." Cox, 17 F.3d at 1422, citing In re Martin Marietta Corp., 856 F.2d 619, 625- 26 (4th Cir. 1988). Petitioners have not identified any documents, for which the government invoked privileges, and for which t

ion Fire Ins. Co. R. Murray Sheet Metal Co., 967 F.2d 980, 984 (4th Cir.1992) (opinion work product "absolutely immune" from discovery); In re Martin Marietta Corp., 856 F.2d 619, 625 (4th Cir.1988); In re John Doe, 662 F. 2d 1073, 1080 ( 4th Cir. 1981), cert. denied 455 U.S. 1000, 102 *463 S.Ct. 1632, 71 L.E