When does the ‘contingency fee’ become permissible?

To decide whether  ‘contingency  fee’ practice  may be allowed  or not, the potential  gains should  be  weighed  against  the  potential  losses.  Hence,  this  again  calls  for  contextual reasoning  based  on  ethical  theories,  which  provide  a  framework  for  assessing  morally relevant issues of the problem.