Question: The toxicological interest of the hair is due to: 
 Options:  <1> His analysis allows to know the toxic exposure in the past. <2> The change in their coloration can facilitate the diagnosis of poisoning. <3> It constitutes an effective protective barrier against the action of corrosives. <4> Its growth is interrupted by the chronic consumption of amphetamines. <5> Hair analysis is of no interest in Toxicology.
1