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The cycle was traveling down a road it would seem, and struck a car that was trying to make a left hand turn onto the road (US road). As far as temperatures and undercarraige goes, you can find any evidence you want, and any temperature you want. Just explain how it will help you reach your...

This is the answer as to it the headlamps were on or not.

There is plenty of clothing, blood, tissue, and hair rubbed into the road from where the cyclist slid down the road. The whole crime scene was properly documented.

Toxicology results showed neither the cyclist or the car driver were under the influence of any impairing substance.

Couple of quick comments.. 1) There is no question if the motorcycle hit the vehicle or not. So the paint chips aren't going to tell you much. 2) To the comment from DYnamo1 regarding the family not knowing about the car pulling out - this is exactly what happened. The car tried to merge...

I'm not familiar with Forensic Biomechanics, so I wouldn't be able to intelligently comment on it. :(

Forensic Quiz #4 - The Motorcycle A motorcyclist is killed in a collision when it hits a car broadside around midnight. The automobile driver is injured from the motorcycle hitting his door, but lives. The family of the motorcyclist insists that the car driver is at fault, because the car...

This post basically nails it on the head. We don't know how much contribution to the measured 0.140 g/100 ml Barney's drinking at played. So taking that into consideration, if asked on the stand by a prosecutor one could either say that because of the time gap it is impossible to perform a...

I think we are getting of track here. It doesn't matter what Barney's prior drinking history is (as in he drinks every night/has a high "tolerance" etc.). You do not have to prove Barney is impaired. The local jurisdiction has a law that says he IS impaired regardless or chronic tolerance, or...

Nothing to do with relativity. Before you use that chart, you have to make some assumptions about Barney's drinking history before you can "back calculate" what his BAC was at an earlier time.

Why yes, it is a Simpsons reference ;) At 0.140, Barney was already almost double the legal limit of 0.080 where it is assumed everyone is impaired to drive. As far as the other possible avenues you were exploring, let's assume Barney didn't know the victim, and there was no debt/drugs involved.

OK. So let's say you have such a chart. What assumptions are you making before you even show the chart?

OK. But you already determined the concentration at the time of the draw to be 0.140 g/100 ml (which is % w/v). What would you do to answer the prosecutor's question?

The Hit and Run A car is pulled over on the side of the road while the driver is out changing the driver's side rear tire. The driver's wife is in the car since it is at night (approximately 1100) and cold. Suddenly a vehicle swerves over and hits the man changing the tire. The vehicle...

Lieberman's test is a general test for alkaloids. It's basically concentrated sulfuric acid with sodium nitrite. It reacts with most common controlled substances, but the color changes are generally pretty subtle and similar. So it's a good first test to differentiate between cocaine and...

Pretty much nailed it, although I disagree that it must be screened with those five color tests, and all of the remaining tests you listed, especially since the Duquenois test is only used on marijuana, not a white powder. Certainly what MUST be done to test is based on an individual lab's...

Density of drug powder wouldn't be very useful, since it is usually cut with other substances at highly variable percentages. For the same reason, refractive indices could possibly be useful, depending on the substance and purity. In this case, we assume a non-pure substance. Good thinking.

Good idea, but not enought time to get a drug sniffing dog to the evidence, and a hit from a drug sniffing dog is usually enough for a search warrant, not charging purposes to put someone in jail. Good thinking though.

The White Powder Case scenario - Officers have removed a small baggy containing a white powder substance. Due to the high flight risk of the individual the powder was removed from, it is imperative that a quick analysis is performed to determine if it is a controlled (contraband) substance...

Anyone interested in another Quiz?