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Amazing. I didn't know that cocaine was so popular in Europe. In Arizona and Nebraska I know that cocaine has fallen off in popularity. The #1 drug is usually methamphetamine, #2 is marijuana, #3 in Arizona is probably crack (cocaine base), and #4 would probably be cocaine salts (HCl - the...

Well performing tests are definately what the "labrats" do. Even if that is doing scene reconstruction type testing. It is pretty rare for any publically funded crime lab to allow anyone to do any research. Usually a lot of that is done by University students/professors who don't actually...

Remember the statistics on the probability of finding detectable cocaine on the $100 bill is based on old data (circa the 1980s). There are new $100 bills in circulation, and cocaine has dropped in popularity in usage in the United States. Cocaine is now #4 on the list of abused drugs, after...

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In a lab I used to work for, we accepted someone with a Masters in Forensics from Scottland. So I would tell you that yes your degree would probably be accepted, but you would probably already have to be in the U.S. before they would agree to hire you.

What is this the plot to the new Batman movie?

Please don't feed the trolls. :rolleyes:

I suggest you purchase a prepared Kastle Meyer solution, not a phenolphthalein pH indicator solution - they are two different beasts. Something like this (note I am not recommending any particular brand, this is just the first one I found on Google)...

OOOHHH. You are using a indicator solution for titration - same chemical, but different chemistry being used for the two types of solutions. What you have isn't going to work. The KM solution starts out already basic, you have to reflux the basic solution with zinc to remove the pink color.

make sure you are only testing a small amount of blood. don't overload your swab and give it another go.

I am stumped as well. That should work as described. Your phenolpthalein solution is colorless correct?

what is the concentration of your hydrogen peroxide? Was that also part of the combo?

Is your solution of phenolpthalein properly prepared? Was it refluxed under basic conditions with zinc until the solution turned clear? Also your steps listed above while probably not the cause of your problem can be simplified as such: Moisten a swab with ethanol (if needed) Swab the area (a...

Please don't feed the trolls. :rolleyes:

Re: fibers/ washing the mouth No. You are referring to cartridge primer residues being primarily lead and baryum. And these are the smallest trace components of GSR. The primary parts of GSR are partially burnt smokeless gunpowder, lead vapor, and carbonacious material. Baryum doesn't...

Re: fibers/ washing the mouth If you are referring to gunsht residue on objects like clothing/doors/cars etc, then the solution that turns "pink" is Sodium Rhodiznate (it is actually supposed to turn purple after a second chemical is applied), and it is a test for lead. If you'd like to know...

Re: fibers/ washing the mouth It doesn't have to do with pH, it has to do with the peroxidase reaction. Look up Kastle-Meyer test, or visit this link: http://en.wikipedia.org/wiki/Kastle-Meyer_test

I would suggest Locard's Exchange Principle, since it is basically the basis for most forensics.

Re: Welcome to the Forensic Science Forum This is turning a little off-topic, but I've never heard of someone shooting themselves because of strong recoil. Sounds more like anti-gunner scare tactics. Strong recoil can occur in magnum type handguns, but work your way up to it. Start with...

I'm not a forensic biologist, but I would have to answer this way: 1) On the basis of antibodies, I don't know if they could differentiate between blood plasma and semen. 2) On other factors, such as enzymes and cell types present, I would think they could easily differentiate.