Re: DHS Wants Cell Phones to Detect Chemical, Radioactive Material

["Brian Loe" <knobdy () gmail com>]

On 6/5/07, Valdis.Kletnieks () vt edu <Valdis.Kletnieks () vt edu> wrote:

> You'll be complaining a lot more that your phone is chirping "Battery Low",
> those biochemical sensors DO chew power, you know.....
>
> At a 3% to 4% false positive rate?  Or even 1%?
>
> 4% FP is acceptable if you're waving the thing around *expecting* to find
> something - it just means that 1 time in 25 you'll evacuate the building when
> you didn't have to.  And if you're waving a sensor around, you're almost
> certainly thinking about evacuating *anyhow*.

I think I get your point on false positives for chemicals - but radiation?

Battery technology going the way it is I'm not so worried. In another
20 years I'll just add water...or better, plug in my foot crank.
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