How many times have you diagramed, charted, and photographed what you thought was blood spatter, but it turned out not to be blood? A quick, easy test that can be done before you spend all this time is to use a Hemastix. It comes in a bottle of fifty individual test strips that you can carry with you to the scene. The Hemastix detects the peroxide-like activity og hemoglobin in a substance. It is simple to use. First, to make sure that the Hemastix are working properly, do a controlled test be removing a simgle strip from the bottle. Apply a drop of distilled water on the little pad on the tip of the stick to moisten it. Rub the pad on a piece of cotton material that has a known dried blood sample on it. The pad will turn from yellow to dark green depending on the amount of hemoglobin found. Compare the reaction to the chart on the side of the bottle. If it is positive, you are now ready to test the suspected substance. Take a new strip and apply a drop of distilled water on the little pad on the tip of the stick to moisten it. Rub the pad on the suspected substance and compare the reaction to the chart on the side of the bottle. If the reaction is positive, take a photograph of the strip by the substance to document the reaction and retain the strip as a piece of evidence. Properly collect the blood sample as evidence.
Frank R Doyle Jr. retired from the FBI reminded me the following about Hemastix. This is very important.
Thank you for you input.
The FBI ERT procedure for using the Hemastix:
One should note they are date sensitive, good for a year max per the date stamped on the bottle. Have had several Drugstores order them only to find the expiration date will only have 6-8 months remaining. Do not accept them. Use the expired Hemastix for training.
Take a sterile swab and put a single drop of distilled water on the tip. Usually use the water ampoules. Preserve it for a control.
Take as second swab and put the drop of water on it and rub the suspect spot believed to be blood.
Touch the wetted swab with the suspect blood on the single Hemastix strip tip.
It should change colors within seconds.
Note: The Hemastix will not detect the difference between human and animal blood.
The Hemastix can be purchased at any drug store or pharmacy for approximately $35.00 per bottle of 50 strips.