Sewn into custom-made underwear, it would have been hard to detect during a pat-down.
The Ministry of Defence (MoD) said it "works hard to detect and deter theft".
But the increase in risk, at something like 40%, is modest and hard to detect.
Some products are better than others in ways that are hard to detect without buying them.
Indeed, they have proved so hard to detect that many physicists question whether they exist.
Such potency makes the substance hard to detect by chemical analysis, which lacks the sensitivity of the nose.
Inspector Morse or Sherlock Holmes would find it hard to detect the crime.
The copied flute riff is hard to detect, he said, negating any negotiating strength Larrikin would have had in 1982.
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It sounds impressive, but in fact, a relatively modest increase in a common ailment such as heart attacks is hard to detect clearly.
On the streets of Patna and in the villages round Arrah, it is hard to detect the anti- Laloo wave touted by his critics.
Even in their announcement detailing Bradshaw's release, it wasn't hard to detect an uneasiness about dumping a member of both their recent Super Bowl triumphs.
It is hard to detect any stirrings of the ominous charisma Matsumoto Chizuo wielded to keep in thrall thousands of followers, a man his devotees call Rev.
The backdoor could take the form of an installed program or subvert the system through what is known as a rootkit, a malicious software hard to detect.
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Until now, cash has often been the only alternative but it is expensive to disburse and particularly susceptible to corruption, fraud and misappropriation that can be hard to detect.
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Researchers at academic medical centers who study the disease say that so-called chronic Lyme, or post-Lyme, is very rare, hard to detect and not treatable with any further doses of antibiotics.
Pistole's supporters believe the rules should be more passenger-friendly and focus on bombs and other threats that can be hard to detect and be smuggled aboard the passenger cabin or in cargo.
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Even if they are there, these B-modes will be very hard to detect, and the Planck team does not intend to make a statement on the issue until a further year of analysis has been completed.
Making the virus hard to detect is that infected poultry display slight or no symptoms, unlike the H5N1 strain which kills birds and raged across the region in the middle of the last decade.
One example: The gene that makes the Epogen protein is expressed in only a few scattered tissues and is hard to detect by conventional gene-finding methods, which discover genes not by looking at DNA but by examining the RNA messengers that ferry genetic code between the DNA itself and the cellular machinery that make proteins.
Thomas Pittman, a retired professor at the University of Southern Mississippi and an expert in toxicology, said ricin has a number of qualities that make it desirable to someone bent on doing harm: The ingredients are relatively easy to obtain, it's not that hard to make a crude form of it, it's deadly and it's hard to detect in a victim's body.
Stuxnet is less of an espionage tool than a way of sabotaging targeted infrastructure, but it does so in a hard-to-detect manner that exploits commercial software utilized throughout the world.
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Asked about what incentives push powerful men to become sexually deviant, given the recent accusations against former IMF director DSK, Levitt noted how hard it was to detect behaviors people are trying to hide.
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It was AQAP that tried to bring down Northwest Flight 253 over Detroit on Christmas Day 2009 using a Nigerian recruit who had secreted a hard-to-detect bomb in his underwear, and it was AQAP that smuggled bombs in printer cartridges onto cargo planes bound for the U.S. in October 2010.
"We are working hard to make sure that we detect cancer earlier, " he said.
The ballpoint pen uses Wacom's pressure sensing technology (1024 levels of sensitivity) to detect how hard the pen is being pressed to the paper while sketching.
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The causes of the rot are easy to detect, and hard to rectify.
While the techniques used by hackers could be hard for non-IT professionals to detect, the best defenses against data loss are surprisingly common sense.
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