Kelly is crime scene investigator. She is examining a stain that she suspects is blood. Presumptive tests indicate blood, so she
is choosing which confirmatory test to use. What are the disadvantages of confirmatory tests?
Kelly considers using the
test to confirm whether the stain is blood; however, she knows that it could be unreliable
because the stain is on a leather boot. Kelly considers using the
test, but she believes the stain may be about 35 years
old, and this test is not as reliable for stains over 20 years.
Confirmatory Tests vary, and may be wrong from time to time. As time passes, the test is not as reliable as stated. If the so called "blood" is on a leather surface, blood isn't too prone to sticking to leather, so it may (or may not) be blood.
The heart of fetus starts to beat at around 6th week of pregnancy and can be heard through sonographically however by week 8th, one can hear it through stethoscope.
Radioprotective agents may be useful as an adjunct to medical imaging to ... compared to those who underwent the same radiation exposure at an older age.
