code: public static void clearEvidence(ProbabilisticNetwork bn,
              ProbabilisticNode node) throws ShanksException {
          if (node.hasEvidence()) {
              Map<String, String> evidences = ShanksAgentBayesianReasoningCapability
                      .getEvidences(bn);
              ShanksAgentBayesianReasoningCapability.clearEvidences(bn);
              evidences.remove(node.getName());
              ShanksAgentBayesianReasoningCapability.addEvidences(bn, evidences);
          }
      }
docs: Clear a hard evidence fixed in a given node
  
  @param node
  @throws ShanksException