diff --git a/harnessed_jobs/persistence_BOT/v0/persistence_jh_task.py b/harnessed_jobs/persistence_BOT/v0/persistence_jh_task.py
index 9fd0626..c6a13c8 100755
--- a/harnessed_jobs/persistence_BOT/v0/persistence_jh_task.py
+++ b/harnessed_jobs/persistence_BOT/v0/persistence_jh_task.py
@@ -4,9 +4,11 @@
 """
 def persistence_jh_task(det_name):
     """JH version of the persistence_task."""
+    import os
     import siteUtils
     from bot_eo_analyses import make_file_prefix, glob_pattern, \
-        bias_frame_task, get_mask_files, get_bot_eo_config, persistence_task
+        bias_frame_task, get_mask_files, get_bot_eo_config, persistence_task, \
+        bias_filename
 
     run = siteUtils.getRunNumber()
     file_prefix = make_file_prefix(run, det_name)
@@ -29,10 +31,14 @@ def persistence_jh_task(det_name):
     bias_files = sorted(bias_files)
     dark_files = sorted(dark_files)
 
-    # Make a superbias frame using the pre-exposure persistence bias
-    # files, skipping the first exposure.
-    superbias_frame = f'{file_prefix}_persistence_superbias.fits'
-    bias_frame_task(run, det_name, bias_files, bias_frame=superbias_frame)
+    use_pca_bias = os.environ.get('LCATR_USE_PCA_BIAS_FIT', "True") == 'True'
+    if use_pca_bias:
+        superbias_frame = bias_filename(run, det_name)
+    else:
+        # Make a superbias frame using the pre-exposure persistence bias
+        # files, skipping the first exposure.
+        superbias_frame = f'{file_prefix}_persistence_superbias.fits'
+        bias_frame_task(run, det_name, bias_files, bias_frame=superbias_frame)
 
     return persistence_task(run, det_name, dark_files, superbias_frame,
                             get_mask_files(det_name))
diff --git a/python/bot_eo_analyses.py b/python/bot_eo_analyses.py
index f840e8c..2b3d303 100644
--- a/python/bot_eo_analyses.py
+++ b/python/bot_eo_analyses.py
@@ -269,10 +269,12 @@ def bias_filename(run, det_name):
         if use_pca_bias:
             pca_bias_model \
                 = hj_fp_server.get_files('bias_frame_BOT',
-                                         f'*{det_name}*_pca_bias.pickle')[0]
+                                         f'*{det_name}*_pca_bias.pickle',
+                                         run=bias_run)[0]
             pca_bias_file \
                 = hj_fp_server.get_files('bias_frame_BOT',
-                                         f'*{det_name}*_pca_bias.fits')[0]
+                                         f'*{det_name}*_pca_bias.fits',
+                                         run=bias_run)[0]
             pca_bias_model = siteUtils.get_scratch_files([pca_bias_model])[0]
             pca_bias_file = siteUtils.get_scratch_files([pca_bias_file])[0]
             filename = pca_bias_model, pca_bias_file