SOURCES: 

Police: Dentist killed wife by lacing shakes with poison

Dentist Poisoned Wife to Death to Start 'New Life' With Paramour, Cops Allege

https://s3.documentcloud.org/documents/23718101/23cr664-craig-james-toliver_redacted.pdf

Oleandrin: A Systematic Review of its Natural Sources, Structural Properties, Detection Methods, Pharmacokinetics and Toxicology - PMC.

Dentist Poisoned Wife to Death to Start 'New Life' With Paramour, Cops Allege

Just a Pinch of Cyanide: The Basics of Homicidal Poisoning Investigations | Office of Justice Programs.

Murder By Poison | The New Yorker

Who was Colorado dentist James Craig's wife Angela and how many children did they have? | Daily Mail Online