Swimming's European governing body (LEN) said that Bree had registered an adverse finding for levmethamfetamine.
"It has to do with the fact that these are relatively modern kingdoms, " says Mr Van Bree.
Dynes, 41, from Bree in Castleblayney, and Sheridan, 36 from Avanmore, Blackwatertown told police they were not planning to use the weapons.
Her video blogs, posted to the popular video sharing site, appeared to chart the troubled life of a teenage girl called Bree.
The new novella is told from the point of view of Bree, a character originally featured in the third Twilight book, Eclipse.
The Short Second Life Of Bree Tanner will go on sale in shops on 5 June and be made available online days later.
Dynes, 41, from Bree, Castleblayney, County Monaghan, was driving the vehicle and Cavlan, from Circular Road, Dungannon, County Tyrone, was sitting in the passenger seat.
US-based Bree is the only Irish swimmer to have so far qualified for this year's Olympics but his place in Beijing is now in doubt.
It added that Bree "abhors the use of performance enhancing drugs".
Ireland's Michael Williamson clocked 1:02.23 in the morning heats of the 100m breaststroke which was a personal best and he will look forward to joining Bree in Sunday's longer event.
BBC: SPORT | Northern Ireland | Bree unable to repeat heroics
That kingdom included modern-day Belgium, and while the Belgians were Catholics, the Dutch were Protestants, raising the "problem of who would put the crown on the king's head", explains Mr van Bree.
The tradition of not crowning the monarch dates from 1815, when Willem I became the monarch of the newly created Kingdom of the Netherlands, says Han van Bree, a historian who specialises in the Dutch royal family.
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