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Tracker's Tech Tips

Tip #39: Why Use a Butterfly Needle in a Blood-Alcohol Kit

Have a suspect that won't sit still? Maybe he has shallow veins? Try taking their blood with a Butterfly Needle.

The needle is attached to a longer tube, not directly to the collection tube, your suspect can move with some degree of ease without jarring the needle or sample out of place.


Tip #38: Tips for using our Fiber Duster Smooth

Twisting and lightly twirling in a circular pattern is the recommended procedure...once you can see the prints develop, careful simple brush strokes "with the grain" can be used to enhance the developing detail.


Tip #37: Hold your evidence package shut

ZiprCheck Pre-Seal is meant to be a strong, aggressive taping method to simply hold your evidence package shut…then you use a seal like Zipr-Weld for your final, tamper indicating seal as required. 


Tip #36: Lifting prints from “slightly” textured surfaces

As you know, our Diff-Lift is probably the best method for all sorts of heavily to slightly textured surfaces. But let’s assume that you don’t have a roll of Diff-Lift with you. You have powdered your latent and are ready to lift. What do you do?

THIS MAY NOT WORK, BUT IT’S WORTH A TRY… The most important thing to do is make sure you make complete contact with the powdered latent and the sticky side of the tape. Do this by applying your tape as usual, then use a burnishing tool…something like the eraser end of an ordinary pencil…or the cap to a Sharpie pen…or even the end of a fingerprint brush will often do. Using your “tool” you want to make sure you rub carefully over the print, making sure you get full and even contact with the textured surface and the powder.

Once you’ve done that…you're home free! (If you want to learn more about Diff-Lift for the future, click here.)


Tip #35: A little secret. You never have to wait using WetPrint.

WetPrint. Rated the best “small particle reagent” in latent processing. The micro-fine particles adhere almost magically to wet or submerged items of evidence.

You don’t have to wait till the evidence has dried…process it as found. And when it has done its developing magic, you may lift with tape…while the evidence is still wet! Simply apply the tape over the wet surface, then squeegee the tape with a roller, credit card, etc. then lift and mount.

Available in Black or White, be ready for the rain or when someone chucks an item of evidence in a puddle, lake or stream. You can get more info (and an instructional video) by clicking here.


Tip #34: HotShots

When “super gluing” for latent prints, humidity can affect how visible the developed latents will become. (If the print is dried out, the development will probably be less than ideal.) Studies have shown that fuming chambers with an interior relative humidity of at least 72-75% produce the best results. But don’t go too wild with the addition of moisture…if too much, everything will become frosty white.

A cup of hot water in the bottom of the chamber for a minute or two before you begin the fuming process is usually enough.

(That is why our HotShot product seems to be so popular…field-ready super glue fuming…that already includes the water!)


Tip #33: Black Nitrile Investigator’s Gloves

When sealing evidence packages with evidence tape, often times the darn stuff is so fragile that it rips and shreds in your hands before you even put it on the item.

Next time, try textured investigator’s gloves. Or even little finger cots with all the little nubs. Less surface area means less area for the adhesive to stick to…meaning fewer mishaps in handling.

Sometimes hard to find, but the Lynn Peavey Company has them in stock, ready to ship. Black Nitrile Investigator’s Gloves. They make a world of difference!