The investigation was conducted / Season 1 Season guide The investigation was conducted: Season 1 32 episodes Premiered Jan 20, 2006 Updated Jul 26, 2026 Spoiler-safe Advertisement Episodes S1·E1 Episode 1 Jan 20, 2006 · 40 min S1·E2 Episode 2 Jan 27, 2006 · 40 min S1·E3 Episode 3 Feb 3, 2006 · 40 min S1·E4 Episode 4 Feb 10, 2006 · 40 min S1·E5 Episode 5 Feb 17, 2006 · 40 min S1·E6 Episode 6 Mar 3, 2006 · 40 min S1·E7 Episode 7 Mar 17, 2006 · 40 min S1·E8 Episode 8 Mar 24, 2006 · 40 min S1·E9 Episode 9 Mar 31, 2006 · 40 min S1·E10 Episode 10 Apr 7, 2006 · 40 min S1·E11 Episode 11 Apr 14, 2006 · 40 min S1·E12 Episode 12 Apr 21, 2006 · 40 min S1·E13 Episode 13 May 19, 2006 · 40 min S1·E14 Episode 14 May 26, 2006 · 40 min S1·E15 Episode 15 Jun 2, 2006 · 40 min S1·E16 Episode 16 Jun 9, 2006 · 40 min S1·E17 Episode 17 Jun 23, 2006 · 40 min S1·E18 Episode 18 Jun 30, 2006 · 40 min S1·E19 Episode 19 Sep 15, 2006 · 40 min S1·E20 Episode 20 Sep 22, 2006 · 40 min S1·E21 Episode 21 Sep 29, 2006 · 40 min S1·E22 Episode 22 Oct 6, 2006 · 40 min S1·E23 Episode 23 Oct 13, 2006 · 40 min S1·E24 Episode 24 Oct 20, 2006 · 40 min S1·E25 Episode 25 Oct 27, 2006 · 40 min S1·E26 Episode 26 Nov 3, 2006 · 40 min S1·E27 Episode 27 Nov 17, 2006 · 40 min S1·E28 Episode 28 Nov 24, 2006 · 40 min S1·E29 Episode 29 Dec 8, 2006 · 40 min S1·E30 Episode 30 Dec 15, 2006 · 40 min S1·E31 Episode 31 Dec 22, 2006 · 40 min S1·E32 Episode 32 Dec 29, 2006 · 40 min