diff --git a/lib/intercept.js b/lib/intercept.js
index b96618f..a2427ff 100644
--- a/lib/intercept.js
+++ b/lib/intercept.js
@@ -21,56 +21,61 @@
 		}
 	}
 	exports.setRandomSupplyByType = setRandomSupplyByType;
-	exports.intercept = function intercept({subject: window}, {check, ask, notify, prefs}){
+	exports.intercept = function intercept({subject: window}, {check, checkStack, ask, notify, prefs}){
+		var siteStatus = check({url: window.location.href});
 		apiNames.forEach(function(name){
 			var changedFunction = changedFunctions[name];
 			var original = window.wrappedJSObject[changedFunction.object].prototype[name];
 			
-			Object.defineProperty(
-				window.wrappedJSObject[changedFunction.object].prototype,
-				name,
-				{
-					enumerable: true,
-					configureable: false,
-					get: function(){
-						if (!window.location.href){
-							return undef;
-						}
-						var error = new Error();
-						var status = check({url: window.location.href, errorStack: error.stack});
-						var funcStatus = changedFunction.getStatus(this, status);
-						
-						if (funcStatus.active){
-							if (funcStatus.mode === "ask"){
-								funcStatus.mode = ask({window: window, type: changedFunction.type, canvas: this, errorStack: error.stack});
+			if (changedFunction.getStatus(undefined, siteStatus).active){
+				Object.defineProperty(
+					window.wrappedJSObject[changedFunction.object].prototype,
+					name,
+					{
+						enumerable: true,
+						configureable: false,
+						get: function(){
+							if (!window.location.href){
+								return undef;
 							}
-							switch (funcStatus.mode){
-								case "allow":
-									return original;
-								case "fake":
-									setRandomSupplyByType(prefs("rng"));
-									var fake = changedFunction.fakeGenerator(prefs, function(messageId){
-										notify({url: window.location.href, errorStack: error.stack, messageId});
-									});
-									switch (fake){
-										case true:
-											return original;
-										case false:
-											return undef;
-										default:
-											return exportFunction(fake, window.wrappedJSObject);
-									}
-								//case "block":
-								default:
-									return undef;
+							var error = new Error();
+							if (checkStack(error.stack)){
+								return original;
+							}
+							var funcStatus = changedFunction.getStatus(this, siteStatus);
+							
+							if (funcStatus.active){
+								if (funcStatus.mode === "ask"){
+									funcStatus.mode = ask({window: window, type: changedFunction.type, canvas: this, errorStack: error.stack});
+								}
+								switch (funcStatus.mode){
+									case "allow":
+										return original;
+									case "fake":
+										setRandomSupplyByType(prefs("rng"));
+										var fake = changedFunction.fakeGenerator(prefs, function(messageId){
+											notify({url: window.location.href, errorStack: error.stack, messageId});
+										});
+										switch (fake){
+											case true:
+												return original;
+											case false:
+												return undef;
+											default:
+												return exportFunction(fake, window.wrappedJSObject);
+										}
+									//case "block":
+									default:
+										return undef;
+								}
+							}
+							else {
+								return original;
 							}
-						}
-						else {
-							return original;
 						}
 					}
-				}
-			);
+				);
+			}
 		});
 	};
 }());
\ No newline at end of file
diff --git a/lib/modifiedAPI.js b/lib/modifiedAPI.js
index ef5a314..27e974e 100644
--- a/lib/modifiedAPI.js
+++ b/lib/modifiedAPI.js
@@ -111,7 +111,7 @@
 			getStatus: function(obj, status){
 				if (hasType(status, "input")){
 					var contextType = canvasContextType.get(obj);
-					status.active = contextType && contextType !== "2d";
+					status.active = contextType !== "2d";
 				}
 				else {
 					status.active = hasType(status, "readout");
@@ -131,7 +131,7 @@
 			getStatus: function(obj, status){
 				if (hasType(status, "input")){
 					var contextType = canvasContextType.get(obj);
-					status.active = contextType && contextType !== "2d";
+					status.active = contextType !== "2d";
 				}
 				else {
 					status.active = hasType(status, "readout");
@@ -152,7 +152,7 @@
 			getStatus: function(obj, status){
 				if (hasType(status, "input")){
 					var contextType = canvasContextType.get(obj);
-					status.active = contextType && contextType !== "2d";
+					status.active = contextType !== "2d";
 				}
 				else {
 					status.active = hasType(status, "readout");
@@ -172,7 +172,7 @@
 			getStatus: function(obj, status){
 				if (hasType(status, "input")){
 					var contextType = canvasContextType.get(obj);
-					status.active = contextType && contextType !== "2d";
+					status.active = contextType !== "2d";
 				}
 				else {
 					status.active = hasType(status, "readout");