diff --git a/www/assets/js/toolbox_scanner.js b/www/assets/js/toolbox_scanner.js
index 47a5b6a..69419ef 100644
--- a/www/assets/js/toolbox_scanner.js
+++ b/www/assets/js/toolbox_scanner.js
@@ -51,6 +51,31 @@ function brokenScannerAddTextEntry() {
 
 function addCodeToScannerList(code) {
     code = code.toUpperCase();
+
+    var signatureregexes = [
+        /^E[A-Z][0-9]{9}US$/, // Priority Mail Express
+        /^[RV][A-Z][0-9]{9}[A-Z]{2}$/, // Registered mail
+        /^(420[0-9]{5})?7[0-9]{19}$/ // Certified Mail
+    ];
+
+    /**
+     * Regex of IMpb codes that don't need anything special
+     * @type {RegExp}
+     */
+    var stcregex = /^(420[0-9]{5})?[0-9]{2}(001|023|055|056|112|113|134|135|138|140|141|142|164|209|211|259|265|269|346|361|389|390|419|431|490|502|551|563|612|624|671|701|702|703|704|723|746|748|790|791|793|794|905|906|907|909|971|972)[0-9]+$/;
+
+    var signatureRequired = false;
+    for (var i = 0; i < signatureregexes.length; i++) {
+        if (code.match(signatureregexes[i])) {
+            signatureRequired = true;
+            break;
+        }
+    }
+
+    if (!code.match(stcregex)) {
+        signatureRequired = true;
+    }
+
     var codeEntryTemplate = Template7.compile('<li class="codelist-entry" data-code="{{code}}">'
             + '  <div class="item-content">'
             + '    <div class="item-inner">'
@@ -58,9 +83,40 @@ function addCodeToScannerList(code) {
             + '    </div>'
             + '  </div>'
             + '</li>');
-    $("#codelist").append(codeEntryTemplate({
-        code: code
-    }));
+
+    if (signatureRequired) {
+        if (code.match(/^E[A-Z][0-9]{9}US$/)) {
+            app.dialog.confirm(
+                    "Does this item contain a waiver of signature endorsement?",
+                    "Express Item",
+                    function () {
+                        $("#codelist").append(codeEntryTemplate({
+                            code: code
+                        }));
+                    },
+                    function () {
+                        // cancel
+                    }
+            );
+        } else {
+            app.dialog.confirm(
+                    "It looks like this item might require a signature or other special procedures. Add it anyways?",
+                    "Signature Item",
+                    function () {
+                        $("#codelist").append(codeEntryTemplate({
+                            code: code
+                        }));
+                    },
+                    function () {
+                        // cancel
+                    }
+            );
+        }
+    } else {
+        $("#codelist").append(codeEntryTemplate({
+            code: code
+        }));
+    }
 }
 
 function chooseScanEvent() {