examining Mr X,  Rumpole points out that during the alleged blackmail Mr X paid the  Lees by cheque, although his previous transactions with the Lees had  always been in cash. Rumpole attempts to use this fact to establish  that the blackmail accusation was false, claiming that that Mr X  deliberately paid by cheque to substantiate his blackmail  allegation. However, even if Mr X did pay by cheque to provide  evidence of the transaction, this does not prove that the blackmail  accusation was false, all it proves is that Mr X wanted evidence of  this transaction. Most people, if they were being blackmailed, would  probably pay by cheque if possible so they would have a better  chance of bringing their blackmailers to justice later on.