diff --git a/tools/reproducibility/R/bcf_global_error_scale_trace.csv b/tools/reproducibility/R/bcf_global_error_scale_trace.csv
index ac10de33..d69df576 100644
--- a/tools/reproducibility/R/bcf_global_error_scale_trace.csv
+++ b/tools/reproducibility/R/bcf_global_error_scale_trace.csv
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index b2f93aa1..03362af6 100644
--- a/tools/reproducibility/R/bcf_y_hat_in_sample.csv
+++ b/tools/reproducibility/R/bcf_y_hat_in_sample.csv
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diff --git a/tools/reproducibility/R/simple-bart.R b/tools/reproducibility/R/simple-bart.R
index a13fc486..d3f83979 100644
--- a/tools/reproducibility/R/simple-bart.R
+++ b/tools/reproducibility/R/simple-bart.R
@@ -76,3 +76,9 @@ if (global_error_scale_mismatch) {
 } else {
   cat("No mismatches found in the global error scale trace")
 }
+
+# Fail the CI job if any results drifted from the stored references
+if (y_hat_mismatch || global_error_scale_mismatch) {
+  cat("\n")
+  quit(status = 1)
+}
diff --git a/tools/reproducibility/R/simple-bcf.R b/tools/reproducibility/R/simple-bcf.R
index 5ce81c73..1afe94f5 100644
--- a/tools/reproducibility/R/simple-bcf.R
+++ b/tools/reproducibility/R/simple-bcf.R
@@ -89,3 +89,9 @@ if (global_error_scale_mismatch) {
 } else {
   cat("No mismatches found in the global error scale trace")
 }
+
+# Fail the CI job if any results drifted from the stored references
+if (y_hat_mismatch || global_error_scale_mismatch) {
+  cat("\n")
+  quit(status = 1)
+}
diff --git a/tools/reproducibility/python/bcf_global_error_scale_trace.csv b/tools/reproducibility/python/bcf_global_error_scale_trace.csv
index 06e917f8..42731930 100644
--- a/tools/reproducibility/python/bcf_global_error_scale_trace.csv
+++ b/tools/reproducibility/python/bcf_global_error_scale_trace.csv
@@ -1,101 +1,101 @@
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diff --git a/tools/reproducibility/python/bcf_y_hat_in_sample.csv b/tools/reproducibility/python/bcf_y_hat_in_sample.csv
index 9cea8fca..22225317 100644
--- a/tools/reproducibility/python/bcf_y_hat_in_sample.csv
+++ b/tools/reproducibility/python/bcf_y_hat_in_sample.csv
@@ -1,201 +1,201 @@
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diff --git a/tools/reproducibility/python/simple-bart.py b/tools/reproducibility/python/simple-bart.py
index 933f7854..c6756029 100644
--- a/tools/reproducibility/python/simple-bart.py
+++ b/tools/reproducibility/python/simple-bart.py
@@ -2,6 +2,8 @@
 # Run BART on a simple dataset and compare results across platforms
 
 # Load libraries
+import sys
+
 import numpy as np
 import pandas as pd
 from stochtree import BARTModel
@@ -64,3 +66,7 @@
         )
 else:
     print("No mismatches found in the global error scale trace")
+
+# Fail the CI job if any results drifted from the stored references
+if np.any(y_hat_mismatch_loc) or np.any(global_error_scale_mismatch_loc):
+    sys.exit(1)
diff --git a/tools/reproducibility/python/simple-bcf.py b/tools/reproducibility/python/simple-bcf.py
index b8f85b09..14ef2452 100644
--- a/tools/reproducibility/python/simple-bcf.py
+++ b/tools/reproducibility/python/simple-bcf.py
@@ -2,6 +2,8 @@
 # Run BCF on a simple dataset and compare results across platforms
 
 # Load libraries
+import sys
+
 import numpy as np
 import pandas as pd
 from scipy.stats import norm
@@ -77,3 +79,7 @@
         )
 else:
     print("No mismatches found in the global error scale trace")
+
+# Fail the CI job if any results drifted from the stored references
+if np.any(y_hat_mismatch_loc) or np.any(global_error_scale_mismatch_loc):
+    sys.exit(1)