--- a/examples/compressors_comparison.py
+++ b/examples/compressors_comparison.py
@@ -25,6 +25,10 @@
 
 import pandas as pd
 
+if int(os.getenv('DEBIAN_POLICY_SECTION_4_9_NO_NETWORK_ACCESS', '0')) > 0:
+    raise IOError('Debian Policy Section 4.9 prohibits network access during build')
+
+
 url = "https://github.com/joblib/dataset/raw/main/kddcup.data.gz"
 names = ("duration, protocol_type, service, flag, src_bytes, "
          "dst_bytes, land, wrong_fragment, urgent, hot, "
