Yes Pado, but times have changed. These new drugs are simply impossible to detect in urine samples, so the only way to determine their use (not their presence) is by studying their effects on the blood, such as an abnormal variation of hematocrit value. And Juventus' medical staff has collected data on blood values from those years, which does show surprising increases in the hematocrit values of some players. In '96, Del Piero, Deschamps and Di Livio's values rapidly raised from 42,3, 43,2 and and 43,4 to 48,4, 51,9 and 51,2 respectively (a > 50 hematocrit value in cycling is considered as life-threatening and earns you immediate suspension). The only substance known to have such a drastic effect on hematocrit values is EPO. Incidentally, those same players have been absorbing high quantities of iron in that period as well, which notoriously reduces the side effects of EPO.
Note that according to the Italian anti-doping legislation, not only is taking illegal substances such as EPO a crime, but so is taking legal medications while you are perfectly fit. When a player passes a urine test at the end of a game, he must list all the legal products he has taken in the past week to the authorities. Based on these declarations, the prosecution has determined the use of psychotropic drugs, anti-depressors, miocardiotopics (not sure about the English name) etc. at Juventus. Agricola has justified this through the heavy playing schedule (3 games in a week) which made some players tired and thus called for medical assistance. But the problem is that these meds have been given to players (Ferrara and Ravanelli) at a time when they were often benched, hence not under enough physical strain to justify their use. So in that respect, the prosecution claims that these legal substances were taken to enhance the players' performances.