Word: detectable
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...Michigan study involving 894 middle and high schools found that random student drug-testing tends to reduce marijuana use slightly (about 5%) but actually increase the use of other drugs (about 3%). The authors theorize that drug-using kids may think that prescription and other drugs are harder to detect by urinalysis, so they switch from pot to something else. (This assumption is usually incorrect - most drug tests capture everything from heroin to Valium - although certain lesser-used drugs like the anesthetic ketamine aren't detected by the usual tests...
...Buying land may be complicated because fraud is sometimes difficult to detect. Land in the ocean could be sold as dry land, but confirming the status of real estate is not outside the scope of the federal government's ability to invest its own money wisely. There might even be thousands of new jobs created for "land inspectors" who have, as their sole duty, ascertaining whether a piece of property exists...
...opposition. "One size doesn't fit all," insists Foster, whose community of some 50,000 people has close business ties to neighboring Piedras Negras, a city three times the size of its U.S. neighbor. He has pressed for a variety of alternative approaches, including the use of sensors to detect illegal movement and the eradication of "Carrizo cane" - an invasive, nonnative, tall river weed that provides easy hiding places along the riverbanks...
...Most commercial airlines are now replacing older three- and four-engine planes with more-efficient double-engine aircraft. Because these newer engines are quieter, birds are less likely to detect and avoid them. Worse still, fewer engines mean fewer backups should a plane and a flock of birds cross paths...
...former assumptions about A. aegypti's behavior: that the female is deaf and a passive participant in the mating ritual and that the male cannot hear frequencies above 1,000 Hz. In fact, the Cornell researchers have established that both the male and female of this subtropical species can detect frequencies as high as 2,000 Hz and that they are equal participants in the courtship process...