Fernando Verdasco failed to renew his exemption for ADHD medicine which caused him to fail a drug test in February.
Verdasco has been using a Therapeutic Use Exemption for ADHD medicine since it was prescribed to him but it's something he has to renew every now and then. He forgot to renew the last time it expired which caused him to return a positive test at a doping test in February at a challenger event.
The IATA was forced to hand him a ban for violation of anti-doping rules but in the statement released they accept that the players did not intend to breach rules:
"His violation was inadvertent and unintentional, and he bears no significant fault or negligence for it."
Due to that Verdasco's ban was reduced from the usual two years to only two months with his TUE exemption renewed and he'll be able to play in January again.