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Someone I know is taking a fingernail drug test tomorrow for a job. Their hair was to short for a follicle so thats the reason for this. From what I know it is similar to a hair follicle. This person rarely uses drugs other than lortab and they have a script for that so it isnt a concern. My question is if they smoked a bowl or two on july 4th, almost 3 months ago, then did a couple grams of shitty coke about 25 days ago is this enough to fail it? Not to familliar with this sort of test so any help would be nice. Thanks.
Fingernail tests are completely news to me. If the detection is similar to a hair test a single use is not likely to show a positive. Being unfamiliar with these kinds of tests I cannot say with certainty that it will be negative, but I think the chances of a positive are very slim. For drug deposition into hair or fingernail use must be relatively high for some period of time.
Drugs of abuse actually have been measured in nails since 1984. However, the need to test for longer detection periods have given Fingernail testing a new niche' to fill.</SPAN>
Like Hair, fingernails and toenails are composed of a hard protein called keratin and are tested with the same process as hair. Drugs are incorporated into nails from the blood stream and remain locked in the nail as it grows. Nails grow in both length and thickness. Drugs enter the nail from the base as the keratin is formed and via the nail bed that extends under the full length of nail. The method of screening for drug use in a fingernail test is the five panel, Enzyme Multiple Immunoassay Test (EMIT). The fingernail is put in a chemical solution to rid the nail of external contaminants and is then liquefied.</SPAN> How far does it go back?</SPAN>
Drugs can be identified in nail clippings 2-4 weeks following ingestion and can be detected up to 8 months after last usage. Fingernails grow approximately 3-5 mm per month, toenails grow at a much slower rate of 1 mm per month which means that drugs can possibly appear in toenail clippings over 1 year after ingestion.
Looks like it's from the fingernail clipping itself. They submerge the clipping in some solvent which cleans it of any contaminants, then they put the clipping in a different solvent which dissolves the clipping and releases the drug analytes. From that point on the analysis is identical to hair drug testing.