The investigation was conducted
Season 4
7
Episodes
Episode 1
Feb 6, 2009
Episode 2
Feb 13, 2009
Episode 3
Feb 20, 2009
Episode 4
Mar 6, 2009
Episode 5
Mar 20, 2009
Episode 6
Mar 27, 2009
Episode 7
Apr 3, 2009
Episode 8
Apr 10, 2009
Episode 9
Apr 17, 2009
Episode 10
Apr 24, 2009
Episode 11
May 22, 2009
Episode 12
May 29, 2009
Episode 13
Jun 5, 2009
Episode 14
Jun 11, 2009
Episode 15
Jun 19, 2009
Episode 16
Jun 26, 2009
Episode 17
Sep 11, 2009
Episode 18
Sep 18, 2009
Episode 19
Sep 25, 2009
Episode 20
Oct 9, 2009
Episode 21
Oct 16, 2009
Episode 22
Oct 23, 2009
Episode 23
Nov 13, 2009
Episode 24
Nov 20, 2009
Episode 25
Dec 18, 2009
Episode 26
Dec 25, 2009