Where is the best place to check permissions of an object?

I am using Laravel for my app and I would like to ask where is the best place to check permissions of an object.

Each model has checkPermissions() method.

So if user make a request to change model client router will call method updateClient() in controller. Should I do it like this:

$client = Client::find(Input::get('id'));
$client->checkPermissions();

or should I create a new method for getting client and check permission inside it? :

$client = Client::getClientById($id);

where getClientById() is method defined on Client model and it check permissions...

Can you describe also why you choose one or another solution? Thanks