Masterson says the company doesn't plan to limit the device's use to drug testing.

FORBES: LifePoint Makes New, Portable Drug Test

Obviously, though, relying on software would limit the case to working with a single device (and let's be realistic, it won't be your beloved Nexus 4).

ENGADGET

Many researchers worry however, that this device has a high error rate, which might limit its usefulness.

FORBES: Sequencing A Child's DNA -- And Convincing An Insurance Company To Pay

"All the advantages of the iPad device are completely neutralized by the two gigabyte data limit, " said Steve Wells, 56.

WSJ: Video on New Apple iPad Eats Up Monthly Data Plans

Damage to your device, (even if through ordinary use) can limit or lessen resistance to dust or moisture.

ENGADGET: Sony ships Xperia advance to the US, offers unlocked ruggedness for $300 or less

Instead, the device performed within the 200-400Mbps range, only jumping beyond that upper limit for a second or two during our demo.

ENGADGET: ASUS G75VW is world's first notebook to sport Broadcom 802.11ac WiFi, we go hands-on (video)

There are also guidelines requiring one-handed operation and a two second limit on "off-road glances" - the time spent looking at the device.

BBC: Hi-tech cars: Driver distraction warning in US