code: def _get_evidence_bam(work_dir, data):
      
      evidence_bam = glob.glob(os.path.join(work_dir, "results", "evidence",
                                              "evidence_*.%s*.bam" % (dd.get_sample_name(data))))
      if evidence_bam:
          return evidence_bam[0]
docs: Retrieve evidence BAM for the sample if it exists