diff --git a/tuf/tests/system_tests/slow_retrieval_server.py b/tuf/tests/system_tests/slow_retrieval_server.py
index 0887d119..161277b6 100755
--- a/tuf/tests/system_tests/slow_retrieval_server.py
+++ b/tuf/tests/system_tests/slow_retrieval_server.py
@@ -24,11 +24,9 @@
 import random
 from BaseHTTPServer import BaseHTTPRequestHandler, HTTPServer
 
-
 DELAY = 1
 
 
-
 # HTTP request handler.
 class Handler(BaseHTTPRequestHandler):
 
@@ -76,4 +74,4 @@ def run(port):
   else:
     port = get_random_port()
 
-  run(port)
\ No newline at end of file
+  run(port)
diff --git a/tuf/tests/system_tests/test_arbitrary_package_attack.py b/tuf/tests/system_tests/test_arbitrary_package_attack.py
index 1ddcb053..b5f207ce 100755
--- a/tuf/tests/system_tests/test_arbitrary_package_attack.py
+++ b/tuf/tests/system_tests/test_arbitrary_package_attack.py
@@ -40,11 +40,6 @@
 
 
 
-# Disable logging.
-util_test_tools.disable_logging()
-
-
-
 class ArbitraryPackageAlert(Exception):
   pass
 
@@ -149,4 +144,4 @@ def test_arbitrary_package_attack(TUF=False):
   test_arbitrary_package_attack(TUF=True)
 
 except ArbitraryPackageAlert, error:
-  print error
\ No newline at end of file
+  print error
diff --git a/tuf/tests/system_tests/test_endless_data_attack.py b/tuf/tests/system_tests/test_endless_data_attack.py
index 9366accf..4cac5531 100755
--- a/tuf/tests/system_tests/test_endless_data_attack.py
+++ b/tuf/tests/system_tests/test_endless_data_attack.py
@@ -43,12 +43,6 @@
 from tuf.interposition import urllib_tuf
 
 
-
-# Disable logging.
-util_test_tools.disable_logging()
-
-
-
 class EndlessDataAttack(Exception):
   pass
 
diff --git a/tuf/tests/system_tests/test_extraneous_dependencies_attack.py b/tuf/tests/system_tests/test_extraneous_dependencies_attack.py
index 72937d65..de327ea7 100755
--- a/tuf/tests/system_tests/test_extraneous_dependencies_attack.py
+++ b/tuf/tests/system_tests/test_extraneous_dependencies_attack.py
@@ -27,18 +27,17 @@
 import tempfile
 import time
 
-import util_test_tools
+import tuf
+import tuf.formats
+import tuf.tests.system_tests.util_test_tools
 import tuf.repo.keystore
 import tuf.repo.signerlib as signerlib
 import tuf.repo.signercli as signercli
 from tuf.interposition import urllib_tuf
 
-
-# Disable logging.
-util_test_tools.disable_logging()
-
 version = 1
 
+
 class ExtraneousDependenciesAttackAlert(Exception):
   pass
 
diff --git a/tuf/tests/system_tests/test_indefinite_freeze_attack.py b/tuf/tests/system_tests/test_indefinite_freeze_attack.py
index 9a5bb1a0..85f457d2 100755
--- a/tuf/tests/system_tests/test_indefinite_freeze_attack.py
+++ b/tuf/tests/system_tests/test_indefinite_freeze_attack.py
@@ -27,21 +27,16 @@
 import tempfile
 import util_test_tools
 
+import tuf
 import tuf.formats
 import tuf.repo.signerlib as signerlib
 from tuf.interposition import urllib_tuf
 
 
-# Disable logging.
-util_test_tools.disable_logging()
-
-
-
 class IndefiniteFreezeAttackAlert(Exception):
   pass
 
 
-
 EXPIRATION = 1  # second(s)
 version = 1
 
diff --git a/tuf/tests/system_tests/test_mix_and_match_attack.py b/tuf/tests/system_tests/test_mix_and_match_attack.py
index 94c40057..29ee9fcf 100755
--- a/tuf/tests/system_tests/test_mix_and_match_attack.py
+++ b/tuf/tests/system_tests/test_mix_and_match_attack.py
@@ -44,11 +44,6 @@
 from tuf.interposition import urllib_tuf
 
 
-# Disable logging.
-util_test_tools.disable_logging()
-
-
-
 class MixAndMatchAttackAlert(Exception):
   pass
 
@@ -195,4 +190,4 @@ def test_mix_and_match_attack(TUF=False):
 try:
   test_mix_and_match_attack(TUF=True)
 except MixAndMatchAttackAlert, error:
-  print error
\ No newline at end of file
+  print error
diff --git a/tuf/tests/system_tests/test_replay_attack.py b/tuf/tests/system_tests/test_replay_attack.py
index 4250a854..1c190dfa 100755
--- a/tuf/tests/system_tests/test_replay_attack.py
+++ b/tuf/tests/system_tests/test_replay_attack.py
@@ -38,16 +38,10 @@
 import urllib
 import tempfile
 
-import util_test_tools
+import tuf.tests.system_tests.util_test_tools as util_test_tools
 from tuf.interposition import urllib_tuf
 
 
-
-# Disable logging.
-util_test_tools.disable_logging()
-
-
-
 class TestSetupError(Exception):
   pass
 
@@ -189,4 +183,4 @@ def test_replay_attack(TUF=False):
 try:
   test_replay_attack(TUF=True)
 except ReplayAttackAlert, error:
-  print error
\ No newline at end of file
+  print error
diff --git a/tuf/tests/system_tests/test_slow_retrieval_attack.py b/tuf/tests/system_tests/test_slow_retrieval_attack.py
index d2f9f4d9..7d25a7d2 100755
--- a/tuf/tests/system_tests/test_slow_retrieval_attack.py
+++ b/tuf/tests/system_tests/test_slow_retrieval_attack.py
@@ -42,15 +42,10 @@
 import subprocess
 from multiprocessing import Process
 
-import util_test_tools
+import tuf.tests.system_tests.util_test_tools as util_test_tools
 from tuf.interposition import urllib_tuf
 
 
-# Disable logging.
-util_test_tools.disable_logging()
-
-
-
 class SlowRetrievalAttackAlert(Exception):
   pass
 
@@ -72,7 +67,8 @@ def test_slow_retrieval_attack(TUF=False):
   # Launch the server.
   port = random.randint(30000, 45000)
   command = ['python', 'slow_retrieval_server.py', str(port)]
-  server_process = subprocess.Popen(command, stderr=subprocess.PIPE)
+  server_process = subprocess.Popen(command, stdout=subprocess.PIPE,
+                                             stderr=subprocess.PIPE)
   time.sleep(.1)
 
   try:
@@ -134,4 +130,4 @@ def test_slow_retrieval_attack(TUF=False):
 try:
   test_slow_retrieval_attack(TUF=True)
 except SlowRetrievalAttackAlert, error:
-  print error
\ No newline at end of file
+  print error
diff --git a/tuf/tests/system_tests/util_test_tools.py b/tuf/tests/system_tests/util_test_tools.py
index 969913db..40024a42 100755
--- a/tuf/tests/system_tests/util_test_tools.py
+++ b/tuf/tests/system_tests/util_test_tools.py
@@ -147,12 +147,6 @@
 
 logger = logging.getLogger('tuf.tests.system_tests.util_test_tools')
 
-# Disable logging for cleaner output.
-def disable_logging():
-  logging.getLogger('tuf')
-  logging.disable(logging.CRITICAL)
-
-
 PASSWD = 'test'
 version = 1
 
diff --git a/tuf/tests/unittest_toolbox.py b/tuf/tests/unittest_toolbox.py
index 02247f8f..673c8ceb 100755
--- a/tuf/tests/unittest_toolbox.py
+++ b/tuf/tests/unittest_toolbox.py
@@ -158,12 +158,6 @@ def setUp(self):
 
 
   def tearDown(self):
-    # Removing 'tuf.log' file from current working directory.
-    """
-    tuf_log_path = os.path.join(os.getcwd(), 'tuf.log')
-    if os.path.exists(tuf_log_path):
-      os.unlink(tuf_log_path)
-    """
     for cleanup_function in self._cleanup:
       # Perform clean up by executing clean-up functions.
       try: