Fingerprints
What type of fingerprint is visible to the naked eye and left in substances like blood or ink?
What is a patent print?
What test separates ink into its components?
What is Thin Layer Chromatography (TLC)?
What is rigor mortis?
What is the stiffening of muscles after death?
What test turns pink in the presence of blood?
What is the Kastle-Meyer test?
What is a positive control used for in forensic testing?
What is to ensure the test works correctly?
What is a fingerprint that must be developed to be seen?
A Latent print
Give one example of a substance tested using TLC in forensic science.
What is ink?
When does livor mortis set in?
30 min - 2 hours
What is a presumptive blood test?
A quick screening test that is not super accurate but can narrow results down
Leading questions in interviews may do what?
What is influence witness answers?
A print made in clay or wax is called what?
A plastic print
What is the purpose of using STRs in DNA profiling?
What is to compare the number of repeats (length) of DNA between individuals?
Which factor can accelerate decomposition?
High heat or humidity
What does high-velocity blood spatter typically indicate?
What is a gunshot wound or fast-moving object?
What is deductive reasoning?
What is drawing specific conclusions from general evidence based on logic and true premises
How do investigators determine if two fingerprints are a match?
Comparing minutiae points and pattern types
What does chromatography separate mixtures based on?
What is size or polarity?
How does low temperature affect rigor mortis?
What is slows its onset and progression?
Which is has more effect on blood spatter: angle of impact or velocity of blood spatter?
angle of impact
What type of argument is this:
Some people who have red pants are serial killers
Mrs. Stindt wears red pants
Mrs. Stindt is a serial killer
A false and invalid argument
Name 2 types of minutiae patterns
Ridge Ending – Where a ridge ends abruptly.
Bifurcation – Where a single ridge splits into two.
Dot (or Island) – A very short ridge that looks like a dot.
Lake (or Enclosure) – A ridge that splits and then rejoins, creating an enclosed space.
Bridge – A short ridge that connects two longer ridges.
Spur (or Hook) – A small ridge branching off a main ridge like a hook.
Crossover (or Crossbar) – A ridge that crosses over another.
Delta – A Y-shaped ridge pattern found near loop and whorl patterns.
Core – The center of a loop or whorl pattern.
Double Bifurcation – A ridge that splits into two, and then one of those splits again.
Trifurcation – A single ridge that splits into three branches.
How many STR matches do you need to make a positive ID
Double points : what are the odds of having a false match if all STR sites match?
13 DNA sites
1 in 1 billion unrelated individuals
Estimate the time of death if a body is found at 8PM with full liver mortis in a 30°F room.
What is 2-6+ hours earlier, possibly around 2PM that day?
What happens to the shape of blood with higher velocity?
It starts to break apart more and will lead to satellites and more spines.
When is Mrs. Stindt's birthday?
February 27th