it's beacuse according to the rules, due to the type of substance, he's allowed to explain

himself if he can

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Very simply - an adverse analytical finding is a potential breach in anti-doping rules, which means that Froome has to explain why there was double the levels of permitted levels of salbutamol in his system.

Here's what the World Anti-Doping Agency say -

2. WHAT IS THE DIFFERENCE BETWEEN AN ADVERSE ANALYTICAL FINDING (AAF) AND AN ANTI-DOPING RULES VIOLATION (ADRV)?
An Adverse Analytical Finding indicates the presence of prohibited substances or methods in a particular sample. Adverse Analytical Findings should not be confused with adjudicated or sanctioned Anti-Doping Rules Violations (ADRV) for several reasons.

First, these figures may contain findings that underwent the Therapeutic Use Exemption (TUE) approval process. In addition, some Adverse Analytical Findings may correspond to multiple measurements performed on the same athlete, such as in cases of longitudinal studies in testosterone (i.e., tracking the testosterone level of one athlete over a period of time).

Posted By: Ralf Scrampton, Dec 15, 16:00:23