Noting 2008, I am assuming you mean WT level in respect of performance level, as 2009 was the first ProTour Garmin outfit iirc? However much like Cervélo in 2009-10 the Garmin outfit could more or less hold its own at any ProTour event in 2008; I remember quite a lot of media fuss about the Giro TTT win as a wildcard team.
But my question is more about the use of 2008 as a line in the sand. It seems to be quite common belief that, although far from clean, the 2008 Tour was arguably the cleanest in a long time (and with AFLD in charge of testing, at least the more egregious dopers were caught, and the CERA test had been held on to so that not everybody was aware of its existence (which due to the long-tail nature of CERA meant quite a few were caught). Speeds were down, relatively speaking.
But then in 2009, AFLD were dismissed from their testing position, and the speeds were back up (VAM record on Verbier etc.), although I accept that this was exacerbated by an absolutely abysmal course design that made it extremely easy for Astana to control throughout and without many obstacles to mean riders were arriving at major mountains fatigued. It seems now from what we have found out in retrospect that your explanation of it taking a hardened doper to continue doping past 2008 that in retrospect, 2008 was something of a false dawn in terms of the péloton in general, is that a reading you would disagree with? I mean, of the 2009 top 10, 4 have served bans (1 of which is CVDV admittedly), 1 further looks like being about to be banned (Kreuziger), and another is Andreas Klöden. Levi would be there too if he hadn't crashed out. It seems alarming that after a year where we could feel that the cheats were getting caught (a number of names thrown out of 2008 Tour for doping or caught later), we would see such a shady top 10 (also, Fränk was of course named in Puerto, and obviously is a hardened doper by your definition since he continued to dope, as he was caught in 2012).
Did you ever consider any need to revisit or revise your policy on that deadline date (I will assume Dekker is excepted as, though his ban stemmed from 2008, that was on retests of 2007 samples), much as Sky have had to re-assess their zero tolerance policy? For example, if they had shown full commitment to clean cycling and were able to convince you they had the talent to ride at the WT level clean, would you take on a rider like, say, Emanuele Sella, who has by most accounts been frank and honest with the authorities and whose evidence has led to a number of subsequent positives and discoveries in Italy, but whose offences were in 2008? What would your stance be on a guy like Rui Costa, who has a ban in his history but is officially cleared of any wrongdoing?