diff --git a/stix2/environment.py b/stix2/environment.py
index 3d9ca30..3be0bb0 100644
--- a/stix2/environment.py
+++ b/stix2/environment.py
@@ -505,71 +505,6 @@ def partial_location_distance(lat1, long1, lat2, long2, threshold):
     return result
 
 
-def _attack_pattern_checks(obj1, obj2, **weights):
-    matching_score = 0.0
-    sum_weights = 0.0
-    if check_property_present("name", obj1, obj2):
-        w = weights["name"]
-        contributing_score = w * partial_string_based(obj1["name"], obj2["name"])
-        sum_weights += w
-        matching_score += contributing_score
-        logger.debug("'name' check -- weight: %s, contributing score: %s", w, contributing_score)
-    if check_property_present("external_references", obj1, obj2):
-        w = weights["external_references"]
-        contributing_score = (
-                w * partial_external_reference_based(obj1["external_references"], obj2["external_references"])
-        )
-        sum_weights += w
-        matching_score += contributing_score
-        logger.debug("'external_references' check -- weight: %s, contributing score: %s", w, contributing_score)
-    logger.debug("Matching Score: %s, Sum of Weights: %s", matching_score, sum_weights)
-    return matching_score, sum_weights
-
-
-def _campaign_checks(obj1, obj2, **weights):
-    matching_score = 0.0
-    sum_weights = 0.0
-    if check_property_present("name", obj1, obj2):
-        w = weights["name"]
-        contributing_score = w * partial_string_based(obj1["name"], obj2["name"])
-        sum_weights += w
-        matching_score += contributing_score
-        logger.debug("'name' check -- weight: %s, contributing score: %s", w, contributing_score)
-    if check_property_present("aliases", obj1, obj2):
-        w = weights["aliases"]
-        contributing_score = w * partial_list_based(obj1["aliases"], obj2["aliases"])
-        sum_weights += w
-        matching_score += contributing_score
-        logger.debug("'aliases' check -- weight: %s, contributing score: %s", w, contributing_score)
-    logger.debug("Matching Score: %s, Sum of Weights: %s", matching_score, sum_weights)
-    return matching_score, sum_weights
-
-
-def _identity_checks(obj1, obj2, **weights):
-    matching_score = 0.0
-    sum_weights = 0.0
-    if check_property_present("name", obj1, obj2):
-        w = weights["name"]
-        contributing_score = w * exact_match(obj1["name"], obj2["name"])
-        sum_weights += w
-        matching_score += contributing_score
-        logger.debug("'name' check -- weight: %s, contributing score: %s", w, contributing_score)
-    if check_property_present("identity_class", obj1, obj2):
-        w = weights["identity_class"]
-        contributing_score = w * exact_match(obj1["identity_class"], obj2["identity_class"])
-        sum_weights += w
-        matching_score += contributing_score
-        logger.debug("'identity_class' check -- weight: %s, contributing score: %s", w, contributing_score)
-    if check_property_present("sectors", obj1, obj2):
-        w = weights["sectors"]
-        contributing_score = w * partial_list_based(obj1["sectors"], obj2["sectors"])
-        sum_weights += w
-        matching_score += contributing_score
-        logger.debug("'sectors' check -- weight: %s, contributing score: %s", w, contributing_score)
-    logger.debug("Matching Score: %s, Sum of Weights: %s", matching_score, sum_weights)
-    return matching_score, sum_weights
-
-
 def _indicator_checks(obj1, obj2, **weights):
     matching_score = 0.0
     sum_weights = 0.0
@@ -596,116 +531,3 @@ def _indicator_checks(obj1, obj2, **weights):
         logger.debug("'valid_from' check -- weight: %s, contributing score: %s", w, contributing_score)
     logger.debug("Matching Score: %s, Sum of Weights: %s", matching_score, sum_weights)
     return matching_score, sum_weights
-
-
-def _location_checks(obj1, obj2, **weights):
-    matching_score = 0.0
-    sum_weights = 0.0
-    if check_property_present("latitude", obj1, obj2) and check_property_present("longitude", obj1, obj2):
-        w = weights["longitude_latitude"]
-        contributing_score = (
-                w *
-                partial_location_distance(obj1["latitude"], obj1["longitude"], obj2["latitude"], obj2["longitude"], weights["threshold"])
-        )
-        sum_weights += w
-        matching_score += contributing_score
-        logger.debug("'longitude_latitude' check -- weight: %s, contributing score: %s", w, contributing_score)
-    if check_property_present("region", obj1, obj2):
-        w = weights["region"]
-        contributing_score = w * exact_match(obj1["region"], obj2["region"])
-        sum_weights += w
-        matching_score += contributing_score
-        logger.debug("'region' check -- weight: %s, contributing score: %s", w, contributing_score)
-    if check_property_present("country", obj1, obj2):
-        w = weights["country"]
-        contributing_score = w * exact_match(obj1["country"], obj2["country"])
-        sum_weights += w
-        matching_score += contributing_score
-        logger.debug("'country' check -- weight: %s, contributing score: %s", w, contributing_score)
-    logger.debug("Matching Score: %s, Sum of Weights: %s", matching_score, sum_weights)
-    return matching_score, sum_weights
-
-
-def _malware_checks(obj1, obj2, **weights):
-    matching_score = 0.0
-    sum_weights = 0.0
-    if check_property_present("malware_types", obj1, obj2):
-        w = weights["malware_types"]
-        contributing_score = w * partial_list_based(obj1["malware_types"], obj2["malware_types"])
-        sum_weights += w
-        matching_score += contributing_score
-        logger.debug("'malware_types' check -- weight: %s, contributing score: %s", w, contributing_score)
-    if check_property_present("name", obj1, obj2):
-        w = weights["name"]
-        contributing_score = w * partial_string_based(obj1["name"], obj2["name"])
-        sum_weights += w
-        matching_score += contributing_score
-        logger.debug("'name' check -- weight: %s, contributing score: %s", w, contributing_score)
-    logger.debug("Matching Score: %s, Sum of Weights: %s", matching_score, sum_weights)
-    return matching_score, sum_weights
-
-
-def _threat_actor_checks(obj1, obj2, **weights):
-    matching_score = 0.0
-    sum_weights = 0.0
-    if check_property_present("name", obj1, obj2):
-        w = weights["name"]
-        contributing_score = w * partial_string_based(obj1["name"], obj2["name"])
-        sum_weights += w
-        matching_score += contributing_score
-        logger.debug("'name' check -- weight: %s, contributing score: %s", w, contributing_score)
-    if check_property_present("threat_actor_types", obj1, obj2):
-        w = weights["threat_actor_types"]
-        contributing_score = w * partial_list_based(obj1["threat_actor_types"], obj2["threat_actor_types"])
-        sum_weights += w
-        matching_score += contributing_score
-        logger.debug("'threat_actor_types' check -- weight: %s, contributing score: %s", w, contributing_score)
-    if check_property_present("aliases", obj1, obj2):
-        w = weights["aliases"]
-        contributing_score = w * partial_list_based(obj1["aliases"], obj2["aliases"])
-        sum_weights += w
-        matching_score += contributing_score
-        logger.debug("'aliases' check -- weight: %s, contributing score: %s", w, contributing_score)
-    logger.debug("Matching Score: %s, Sum of Weights: %s", matching_score, sum_weights)
-    return matching_score, sum_weights
-
-
-def _tool_checks(obj1, obj2, **weights):
-    matching_score = 0.0
-    sum_weights = 0.0
-    if check_property_present("tool_types", obj1, obj2):
-        w = weights["tool_types"]
-        contributing_score = w * partial_list_based(obj1["tool_types"], obj2["tool_types"])
-        sum_weights += w
-        matching_score += contributing_score
-        logger.debug("'tool_types' check -- weight: %s, contributing score: %s", w, contributing_score)
-    if check_property_present("name", obj1, obj2):
-        w = weights["name"]
-        contributing_score = w * partial_string_based(obj1["name"], obj2["name"])
-        sum_weights += w
-        matching_score += contributing_score
-        logger.debug("'name' check -- weight: %s, contributing score: %s", w, contributing_score)
-    logger.debug("Matching Score: %s, Sum of Weights: %s", matching_score, sum_weights)
-    return matching_score, sum_weights
-
-
-def _vulnerability_checks(obj1, obj2, **weights):
-    matching_score = 0.0
-    sum_weights = 0.0
-    if check_property_present("name", obj1, obj2):
-        w = weights["name"]
-        contributing_score = w * partial_string_based(obj1["name"], obj2["name"])
-        sum_weights += w
-        matching_score += contributing_score
-        logger.debug("'name' check -- weight: %s, contributing score: %s", w, contributing_score)
-    if check_property_present("external_references", obj1, obj2):
-        w = weights["external_references"]
-        contributing_score = w * partial_external_reference_based(
-            obj1["external_references"],
-            obj2["external_references"],
-        )
-        sum_weights += w
-        matching_score += contributing_score
-        logger.debug("'external_references' check -- weight: %s, contributing score: %s", w, contributing_score)
-    logger.debug("Matching Score: %s, Sum of Weights: %s", matching_score, sum_weights)
-    return matching_score, sum_weights