diff --git a/contrib/search_blocked_words.sh b/contrib/search_blocked_words.sh
new file mode 100755
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+++ b/contrib/search_blocked_words.sh
@@ -0,0 +1,71 @@
+#!/bin/bash
+
+# Copyright 2020 The Chromium OS Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+# Scripts to search blocked words.
+#
+# Usage: search_blocked_words.sh [/path/to/word_list.txt]
+#
+# Use case 1: Search all globally blocked words.
+#
+#   $ search_blocked_words.sh ~/trunk/src/repohooks/blocked_terms.txt
+#
+# - This is useful when first introducing unblocked_terms.txt to a repo.
+# - This is also useful to verify the blocked words indeed do not exist.
+#   Some CLs may have checked in blocked words using '--no-verify' flag
+#   circumventing the repo check.
+#
+# Use case 2: Search all words in the local unblock list.
+#
+#   $ search_blocked_words.sh
+#
+# - This is useful to learn the current COIL status.
+
+input_file=${1:-unblocked_terms.txt}
+if [[ ! -r "${input_file}" ]]; then
+  echo "Error: '${input_file}' not found."
+  echo "Have you copied repohooks/unblocked_terms.txt?"
+  echo "Read repohooks/README.md for more information."
+  exit 1
+fi
+
+all=$(git ls-tree -r --name-only HEAD)
+
+# Create list of paths without symlinks.
+paths=()
+while IFS= read -r path; do
+  [[ -L "${path}" ]] && continue
+  paths+=("${path}")
+done <<< "${all}"
+
+# Create lists of dirs, files, symlinks. Must be basename and have no duplicate.
+# We use xargs (instead of directly feeding to dirname or basename) to avoid
+# exceeding argument size limit.
+dirs=$(echo ${all} | xargs dirname | sort -u | xargs basename -a)
+files=$(echo ${all} | xargs basename -a)
+
+results=("reg_exp #lines #files #filenames")
+while read -r regex; do
+  # Skip blank and comment lines.
+  [[ -z "${regex}" ]] && continue
+  [[ "${regex}" == "#"* ]] && continue
+
+  # Count matching lines.
+  line_count=$(echo "${paths[@]}" | xargs grep -E -i -I -c "${regex}" \
+      | awk -F: '{ s+=$2 } END { print s }')
+
+  # Count matching paths.
+  path_count=$(echo "${paths[@]}" | xargs grep -E -i -I -l "${regex}" | wc -l)
+
+  # Count matching file & dir names.
+  name_count=$(echo "${files}" "${dirs}" | grep -E -i "${regex}" | wc -l)
+
+  # Save result.
+  results+=("${regex} ${line_count} ${path_count} ${name_count}")
+done < "${input_file}"
+
+# Present results.
+printf '%s\n' "${results[@]}" | column --table --table-right 2,3,4
+