With a banned substance, that element of doubt isn't there, a ban is issued, irrespective of the athlete's explanation.
Except that riders have been cleared in clenbuterol cases where they gave acceptable explanations, e.g. https://www.theguardian.com/sport/2014/apr/23/michael-rogers-uci-contaminated-meat
I know, but you pretty much have to show you've spent time in a country with a known issue of administering clenbuterol to cattle, i.e. China or Mexico, to be cleared. Spain doesn't count.
@andyp started
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Except that riders have been cleared in clenbuterol cases where they gave acceptable explanations, e.g. https://www.theguardian.com/sport/2014/apr/23/michael-rogers-uci-contaminated-meat