[s4e23] Roadkill Access

is the 23rd episode of the fourth season of the crime procedural series Criminal Minds , which originally aired on May 6, 2009 .

: Revealed to be Mason Weaver , a man suffering from severe emotional trauma and a physical disability (paralysis from the waist down) caused by a car accident. [S4E23] Roadkill

The episode follows the Behavioral Analysis Unit (BAU) as they travel to , to investigate a series of vehicular homicides. The "Unsub" (unknown subject) uses a modified, heavy-duty truck as a weapon to run victims off the road or crush them. Key Plot Elements is the 23rd episode of the fourth season

: Weaver targets people he believes are irresponsible drivers, acting out a vigilante fantasy to "punish" those who make the roads unsafe, mirroring the accident that ruined his own life. The "Unsub" (unknown subject) uses a modified, heavy-duty