i'm surprised that servais knaven (their other dutch DS) is still working for sky to be honest. The doping rumours around him have been stronger than those surrounding the jongh. Both were part of the TVM team that got raided in 1998 in which the docter, DS and soigneur got arrested and convicted by the french police after they found a complete pharmacy in a team car (104 ampules of EPO amongst other things.) As there was no test for EPO in those days all the riders walked free despite many if not all of them being dragged by police to the local hospital for blood, hair and urine samples.
De Volkskrant, one of the leading newspapers in the netherlands reported in 2001 that traces of EPO had been found in the samples of the following cyclists: Jeroen Blijlevens, Servais Knaven, Bart Voskamp and russian Sergei Oetsjakov. The test however had not been validated as a testmethod so neither UCI or IOC imposed sanctions.
Apart from the 104 ampules of EPO french police found the following in the docters suitcase: corticoïed ACTH, caffeïnetablets and ventoline