What’s on the Expert Evidence and Numbers poster
The rule, 3 worked examples, and the mistake everyone makes.
- The chance of seeing this evidence if the person is innocent is not the chance they a…
- P(evidence | innocent) ≠ P(innocent | evidence)
- Match odds 1 in a million = Not the odds of guilt
- Large database searched = Chance matches rise
- Two rare findings = Do not simply multiply
- Common mistake: One in a million match, so guilty → Ask how many people could match
Educational reference. Courts increasingly expect likelihood ratios with stated assumptions rather than bare probability claims.
Questions about the Expert Evidence and Numbers poster
- What’s on the Expert Evidence and Numbers poster?
- The rule, 3 worked examples, and the mistake everyone makes. The chance of seeing this evidence if the person is innocent is not the chance they a…; P(evidence | innocent) ≠ P(innocent | evidence); Match odds 1 in a million = Not the odds of guilt; Large database searched = Chance matches rise; Two rare findings = Do not simply multiply; Common mistake: One in a million match, so guilty → Ask how many people could match. Educational reference. Courts increasingly expect likelihood ratios with stated assumptions rather than bare probability claims.
- Who is the Expert Evidence and Numbers poster for?
- Expert Evidence and Numbers belongs to the Criminal Justice section rather than to a school year, because law & society is not something one grade owns. Anyone learning forensic science can pin it up — a beginner, a student mid-course, or someone revising years later.
- When should you use the Expert Evidence and Numbers poster?
- Use it whenever a forensic statistic is restated as odds that a defendant is guilty. A wall chart earns its place by being glanceable from where the work is happening, so Expert Evidence and Numbers belongs on the wall where that law & society work actually happens, within glancing distance, rather than filed away.
- What other posters go with Expert Evidence and Numbers?
- Chain of Custody, Crime Scene Management and Digital Evidence sit alongside Expert Evidence and Numbers in the Criminal Justice section. Printed together they make a wall rather than a single sheet, which is how a reference set actually gets used.Chain of CustodyCrime Scene ManagementDigital Evidence
- Is the Expert Evidence and Numbers poster free to download and print?
- Yes. Expert Evidence and Numbers downloads as a free PDF with no account, no email and no watermark, like everything else in the Criminal Justice section. Print as many copies as you like for a home, a classroom, a library or a tutoring group; reselling the file is the only thing the licence rules out.Read the licence
- What size does the Expert Evidence and Numbers poster print at?
- Expert Evidence and Numbers is a vector PDF laid out for US Letter, and prints on A4 with Fit to page — the same file, no separate download. Because every mark on it is drawn rather than photographed, it stays sharp enlarged to A3, A2 or A1 at a copy shop. Colour carries emphasis only, so a greyscale print of Expert Evidence and Numbers loses nothing.Printing guide
Related posters
Charts that sit alongside Expert Evidence and Numbers on the same wall.
Browse every Criminal Justice poster, or start from the full catalogue.