No ghost

2x09 Mind Hunters
2x09 Mind Hunters  Directed by Kevin Bray
 Written by Veena Cabreros Sud
 First Air Date : Sunday, 28 November 2004
 Flashback year : 1985 (19 years ago)
   Based on real case : Robert Hansen

The headless torso of a woman who disappeared in 1985, on the same day she filed domestic-abuse charges against her husband, is found by hikers in a wildlife preserve. The investigation quickly leads to the grisly discovery of 8 more decapitated bodies, the victims of a serial killer.

2x20 Kensington
2x20 Kensington  Directed by Bill Eagles
 Written by Sean Whitesell
 First Air Date : Sunday, 24 April 2005
 Flashback year : 1985 (20 years ago)
   

The murder case of a young mill worker is re-opened when Rush learns that a recent parolee admitted to stealing money off the victim's body.

4x04 Baby Blues
4x04 Baby Blues  Directed by David Barrett
 Written by Liz Garcia
 First Air Date : Sunday, 15 October 2006
 Flashback year : 1982 (24 years ago)
   

Lilly re-investigates a 1982 case where a newborn baby died under suspicious circumstances of what was reported as SIDS (sudden infant death syndrome).

4x08 Fireflies
4x08 Fireflies  Directed by Marcos Siega
 Written by Erica Shelton
 First Air Date : Sunday, 12 November 2006
 Flashback year : 1975 (31 years ago)
   

When an undelivered letter with a missing child's handwriting on it shows up, the team is prompted to re-open the case of an 8-year-old girl who disappeared in 1975.

5x18 Ghost of my Child
5x18 Ghost of my Child  Directed by Roxann Dawson
 Written by Liz Garcia
 First Air Date : Sunday, 4 May 2008
 Flashback year : 2005 (3 years ago)
   Based on real case : Delimar Vera

In the season finale, a drug addict mother, who lost her son in an apartment fire in 2005, comes forth claiming she just saw the same child in the park.

6x22 The Long Blue Line
6x22 The Long Blue Line  Directed by Roxann Dawson
 Written by Jennifer Johnson Greg Plageman
 First Air Date : Sunday, 3 May 2009
 Flashback year : 2005 (4 years ago)
   

During the team's investigation of the 2005 murder of the first female cadet of a local military school, suspects abound as they discover how brutally she was treated from Day One by an array of resentful male cadets and school officials.

A cadet shall not lie, cheat or steal, nor shall he tolerate those who do.

Break down the individual, build up the group.

7x18 The Last Drive-In
7x18 The Last Drive-In  Directed by Chris Fisher
 Written by Elwood Reid
 First Air Date : Sunday, 28 March 2010
 Flashback year : 1980 (30 years ago)
   

When ballistics tie a recent murder case of Rush's to a serial killer who was seemingly inactive for 27 years, a tough FBI agent with ties to Stillman shows up to enlist the team's aid in finding the killer who has eluded her for 30 years.