Ib tus tsim ntawm "muaj cawv" zoo yog David Nutt, tus thawj coj ntawm neuropharmacology chav haujlwm ntawm Imperial College London. Nws pib txoj haujlwm no vim nws ntseeg tias haus cawv ua rau lub cev puas ntau dua li qhov muag "tshuaj".
Cov kws tshaj lij hauv tebchaws Askiv tau sim tsim "cov cawv" rau ntau tshaj 10 xyoo. Nws tau kwv yees tias nws yuav tuaj yeem ua rau tib neeg txog tib qho kev xav zoo li ib txwm, tab sis tib lub sijhawm nws yuav tsis ua rau daim siab puas, ua rau lub cev mob hnyav thiab mob lub cev tawm.
Cov dej haus tsis yog raws cov dej cawv ethyl, tab sis ntawm cov qauv sib txawv (lossis "dej cawv" ntawm molecules), tab sis nws cov mis tsis tau qhia tawm. Nws paub tias thawj cov kev sim tau nqa tawm nrog benzodiazepine derivatives. Rov qab rau xyoo 1980, Nutt muaj peev xwm qhia tau tias cov tshuaj no yog cov neeg sib tw zoo rau kev haus cawv rau kev khi GABA cov neeg txais kev pabcuam thiab tuaj yeem ua qhov tshuaj rau qhov qaug cawv yog tias lawv tus kheej tsis txaus ntshai rau lub cev tshuaj, sau Nrov Cov Txheej Txheem.