diff --git a/static/js/dicomViewer.js b/static/js/dicomViewer.js
index da98640c..b176ae2c 100644
--- a/static/js/dicomViewer.js
+++ b/static/js/dicomViewer.js
@@ -15,7 +15,6 @@ cornerstoneTools.init({
 
 let tool_state = {};
 
-
 export function loadCornerstone(main_element, db, images, annotations_to_load, load_as_stack = false) {
     // canvas-panel holds the enabled elements and all tools / menus
     const canvas_panel = $("<div class='canvas-panel'></div>");
@@ -982,10 +981,11 @@ function loadCornerstoneMainImage(element, image, stack, db, load_as_stack) {
     loadAltDicomInterface(db);
 
     element.addEventListener("cornerstoneimagerendered", onImageRendered);
+    element.addEventListener("cornerstonenewimage", onNewImage);
     //element.addEventListener("cornerstonetoolskeydown", keyDownHandler);
 
     //setDicomCanvasNonFullscreen(element);
-   cornerstone.reset(element);
+    cornerstone.reset(element);
     //element.scrollIntoView(false);
     //element.scrollTo(0);
 
@@ -1021,7 +1021,9 @@ function loadCornerstoneMainImage(element, image, stack, db, load_as_stack) {
 
     $(element).on("mouseup", function (event) {
         console.log(event)
-        if (event.which == 4) { getNextAnnotationImage(element)}
+        if (event.which == 4) {
+            getNextAnnotationImage(element)
+        }
         $(".magnifyTool").hide();
     });
 }
@@ -1062,6 +1064,44 @@ async function loadAltDicomInterface(db) {
     });
 }
 
+function onNewImage(e) {
+    let dataSet = e.detail.image.data;
+    let accession_number = dataSet.string('x00080050').toLowerCase();
+    let patient_id = dataSet.string('x00100020').toLowerCase();
+
+    let not_anon = false;
+
+    let site_codes = ["ref", "rk9", "ra9", "rh8", "rbz", "rba"]
+
+    for (let i = 0; i < site_codes.length; i++) {
+        if (
+            accession_number.startsWith(site_codes[i]) ||
+            patient_id.startsWith(site_codes[i])) {
+            not_anon = true;
+        }
+    }
+
+    if (not_anon) {
+        toastr.warning(`File does not appear to be annonymised<br/>Accession: ${accession_number} <br/>Patient ID: ${patient_id}<br/>`, 'Anonymisation warning', {
+            "closeButton": false,
+            "debug": false,
+            "newestOnTop": false,
+            "progressBar": false,
+            "positionClass": "toast-top-full-width",
+            "preventDuplicates": false,
+            "onclick": null,
+            "showDuration": "0",
+            "hideDuration": "0",
+            "timeOut": 0,
+            "extendedTimeOut": 0,
+            "showEasing": "swing",
+            "hideEasing": "linear",
+            "showMethod": "fadeIn",
+            "hideMethod": "fadeOut",
+        });
+    }
+}
+
 // Called when the dicom image is loaded / rendered
 function onImageRendered(e) {
     const eventData = e.detail;