The phrase "confessed using" is correct and usable in written English.
It is often used in the context of someone confessing to using something illegal, harmful, or wrong. For example: Stacy confessed to using the company's money without authorization.
Reversing course after years of denial, the disgraced cyclist confessed use of performance-enhancing drugs during his career, according to Oprah.
Although hair samples were also tested for recreational drugs (5 out of the 10 positive samples for doping were also positive for recreational drugs), parallel psychological testing was only performed in relation to doping, hence the confessed use of recreational drugs and/or positive hair samples for such substances will not be addressed in this report.
In her signed confession, the former prison tailor-shop supervisor confessed to using her access to sneak the prisoners hacksaw blades, chisels, and a screwdriver.
At Wesleyan, the committee could not see the wisdom of admitting a student who had confessed to using drugs.
He had also confessed to using forged documents, received in Azerbaijan, to travel to Tel Aviv, the broadcaster said.
At least one other contestant has confessed to using dangerous weight-loss techniques, including self-induced dehydration.
Plenty of cricketers have been caught, and occasionally even confessed to using, cannabis, cocaine, even, in one especially recherché recent case, opium.
When we phoned Mr. Dufresne for some home-kitchen-friendly tips, he confessed to using an inexpensive home smoker in unconventional ways; for example, smoking mashed potatoes.
Yankees fans cheered Andy Pettitte, who confessed to using H.G.H., and Jason Giambi, who swelled to the size of the Incredible Hulk before his body said no más.
