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File, Associated Press
In this Aug. 19, 2011, photo, Steven Powell, the father-in-law of missing Utah woman Susan Powell, talks in Puyallup, Wash., about the search for Susan Powell.

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OLYMPIA, Wash. (AP) — The father-in-law of a missing Utah woman is in court on Monday seeking to suppress evidence used to charge him with voyeurism and possession of child pornography.

Steven Powell has argued that a search warrant used to collect files from his home last summer was a fishing expedition to seek evidence that might link his son, Josh, to Susan Powell's 2009 disappearance.

Authorities say they found thousands of images of females being videotaped without their knowledge, including Susan Powell. Some of the girls were as young as 8 years old.

Steven Powell has pleaded not guilty. His trial is scheduled to begin in two weeks.

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Investigators have said they are still interested in speaking with Steven Powell about the disappearance of his daughter-in-law. They say he has been uncooperative in that investigation.

Authorities say that Steven Powell's bedroom also contained images of nude female bodies with Susan Powell's face copied onto them, according to court documents.

In her personal journals, Susan Powell wrote that she wished her husband would sever ties with Steven Powell. She described Steven Powell as a pedophile.

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Steven Powell Warrants

Josh Powell storage unit search warrant