Wallace is a Senior Fellow at the Colson Center for Christian Worldview and an adjunct professor of Apologetics at Talbot School of Theology (Biola University) in La Mirada, California.

[1] In 1988, Wallace returned to law enforcement, attending the Los Angeles Sheriff's Academy as a recruit for the Torrance Police Department (graduating again as the Honor Cadet).

During his law enforcement career, Wallace served in a number of assignments, including the Metro Unit, Gang Detail, SWAT, Special Investigations Division, and Robbery / Homicide.

He applied a technique known as Forensic Statement Analysis[2] to the transcripts of a confession from an early suspect in the 1972 murder of Teri Lynn Hollis.

Believing this sample contained DNA from the true killer, Wallace submitted the evidence to the CODIS database for sexual offenders.

[circular reference] It failed to match anyone in the national registry, and the case remained unsolved until ancestry DNA technology became available to the agency in 2017.

[10] In 1996, Wallace became a Christian at the age of 35, after investigating the gospels as potential eyewitness accounts to the life of Jesus using his detective expertise.