I thought they asked for verification. Or was it only for webmaster tool? And even so I supposed after the verification step the code is active so anyone could

I thought they asked for verification. Or was it only for webmaster tool? And even so I supposed after the verification step the code is active so anyone could use it. Does GA code ever expire? Sounds like an expiration date would be a reasonable solution plus a way for the account holder to deactivate the code from admin panel.