Accident or Arson? By Tyler Pfohl & Jeffry
Breitbach
Overview• Mansion fire in a suburban neighborhood• Police were called at 8:00 PM on a Tuesday
evening• Appears that there was forced entry (window
punched in)• Appears that the fire started in the living room• Possible suspects are Mr. Rusch and Mr.
Thompkins
Suspect 1: Mr. Rusch• Owner of the mansion• Stock market investor• Due to bad investments owed the bank
nearly one million dollars (wife didn’t know about it)
• Carried a home insurance policy that covers loss due to accidental fire of $2,250,000
• At the time of the fire, he claimed to be working alone in his office although nobody could vouch for this
• Claims that the cuts on his left hand were from falling off of his bike
Suspect 2: Mr. Thompkins• Prosecuted in a drug bust 10
years ago by Mr. Rusch’s wife• Accused of sending threatening
letters to Mrs. Rusch shortly after parole
• Claims the cuts on his right hand were from removing a rose bush in his yard
EVIDENCEBroken Window Pane Glass
Matches and Piece of Paper
Bloody Rag with Type O Blood
White Powdery Substance
Shoe Print Soil
Threatening Letter
Broken Window Pane Glass
Broken Window Pane Glass• Experiments–Density of glass–Refractive indexes of glass–Compared to samples of glass
taken from each of the suspects’ boots
Matches and Piece of Paper
Matches and Piece of Paper• Experiments– Iodine fuming–Compared matches in incendiary
device to match book found in Mr. Rusch’s possession
Bloody Rag with Type O Blood
Bloody Rag with Type O Blood• Experiments–ABO/Rh blood typing–Compared to the blood samples
taken from each suspect
White Powdery Substance
White Powdery Substance• Experiments–General appearance–Reaction with water, HCl, and Ferric
Nitrate–Universal Indicator–Appearance under UV light–Compared to pills found in Mr.
Thompkins’ possession and to other substances
Shoe Print Soil
Shoe Print Soil• Experiments–General appearance–Acidity of soil–Particle size testing–Chemical reactions of soil–Compared to the soil samples
taken from each of the suspects’ boots
Threatening Letter
Threatening Letter• Experiments–Ninhydrin test–Carbon black powder dusting–Handwriting analysis–Compared to Mr. Thompkins’
handwriting sample
Conclusion• Mr. Thompkins doesn’t have enough
evidence against him to make him a prime suspect
• Mr. Rusch has some evidence but not enough to convict him
• More evidence is necessary to convict a suspect if it was arson
• Possibility that it was an accident