diff --git a/pytikitag/nfc/ndef.py b/pytikitag/nfc/ndef.py
index 870095a..aef0449 100644
--- a/pytikitag/nfc/ndef.py
+++ b/pytikitag/nfc/ndef.py
@@ -2,9 +2,6 @@ from smartcard.util import toASCIIString
 
 class NDEFReader():
 
-    _records = []
-    items = []
-
     _uri_lookup = { 0x00: "", 0x01: "http://www.", 0x02: "https://www.",
                     0x03: "http://", 0x04: "https://", 0x05: "tel:",
                     0x06: "mailto:", 0x07: "ftp://anonymous:anonymous@",
@@ -36,6 +33,9 @@ class NDEFReader():
                 
     def __init__(self, ndef):
 
+        self._records = []
+        self.items = []
+
         if not ndef:
             raise ValueError
     
diff --git a/pytikitag/nfc/type2.py b/pytikitag/nfc/type2.py
index 077010c..ef7387a 100644
--- a/pytikitag/nfc/type2.py
+++ b/pytikitag/nfc/type2.py
@@ -2,10 +2,10 @@ import ndef
 
 class NFCType2():
 
-    tags = []
-    ndefs = []   
-
     def __init__(self, data):
+        
+        self.tags = []
+        self.ndefs = []  
                
         if not data:
             raise ValueError
diff --git a/pytikitag/tikitag.py b/pytikitag/tikitag.py
index 1bb9d33..ea64112 100644
--- a/pytikitag/tikitag.py
+++ b/pytikitag/tikitag.py
@@ -5,7 +5,7 @@ from smartcard.util import toHexString, toASCIIString
 class TikiTag(mifareul.MiFareUltralight):
 
     _tag = None
-    _uid = None
+    _uid = ""
 
     def get_uid(self):
     
@@ -15,27 +15,15 @@ class TikiTag(mifareul.MiFareUltralight):
             uid = toHexString(d).replace(" ", "")[:16]
 
             return uid
-    
-    def _check_uid(self):
-        uid = self.get_uid()
-        if (not self._uid == uid):
-            self._tag = None
-            self._uid = uid  
-            return False
-        else:
-            return True  
-            
+                        
     def get_tag_url(self):
         """ Retreives the tag's URL stored in NDEF format """
         
         # The tikitag usually has a single NDEF with a single URI record type
         # so assumptions can be made here.
-        
-        self._check_uid()
-               
-        if not self._tag:
-            d = self.read_tag()
-            self._tag = type2.NFCType2(d)
+      
+        d = self.read_tag()
+        self._tag = type2.NFCType2(d)
     
         return self._tag.ndefs[0].items[0][1]