diff --git a/sanitiser/_layers.js b/sanitiser/_layers.js
deleted file mode 100644
index b7922557..00000000
--- a/sanitiser/_layers.js
+++ /dev/null
@@ -1,46 +0,0 @@
-
-var check = require('check-types'),
-    types = require('../query/types'),
-    get_layers = require('../helper/layers');
-
-// decide which layers can be queried
-var ALIAS_LAYERS  = ['poi', 'admin', 'address'],
-    ALIAS_TYPES = types.concat(ALIAS_LAYERS),
-    ALIAS_TYPES_JOINED = ALIAS_TYPES.join(',');
-
-// validate inputs, convert types and apply defaults
-function sanitize( raw, clean ){
-
-  // error & warning messages
-  var messages = { errors: [], warnings: [] };
-
-  // init clean.types
-  clean.types = clean.types || {};
-
-  // default case (no layers specified in GET params)
-  // don't even set the from_layers key in this case
-  if( check.unemptyString( raw.layers ) ){
-
-    // parse GET params
-    var layers = raw.layers.split(',').map( function( layer ){
-      return layer.toLowerCase(); // lowercase inputs
-    });
-
-    // validate layer names
-    for( var x=0; x<layers.length; x++ ){
-      if( -1 === ALIAS_TYPES.indexOf( layers[x] ) ){
-        messages.errors.push('invalid param \'layers\': must be one or more of ' + ALIAS_TYPES_JOINED);
-      }
-    }
-
-    // set 'from_layers' param
-    if( !messages.errors.length ){
-      clean.types.from_layers = get_layers(layers);
-    }
-  }
-
-  return messages;
-}
-
-// export function
-module.exports = sanitize;