 There is virtually no case law on the constitutionality of variations rendering the probation order more onerous, such as adding terms and conditions.Conditional sentences may be varied in a similar matter except the duration cannot be varied.Where the court imposes a driving prohibition over 5 years, the Parole Board of Canada may decrease the period of prohibition after 5 years where the court-imposed prohibition is less than life or after 10 years where the court imposed prohibition was life.