cssd-back/app/Policies/PackagePolicy.php

<?php

namespace App\Policies;

use App\User;
use App\Package;

class PackagePolicy
{
    public function showAll(User $User)
    {
        if($User->hasRole('Admin'))
            return true;
    }

    public function delete(User $User, Package $Package)
    {
        if($User->hasRole('Admin') || ($User->hasRole('Supervisor') && $Package->user->medical_center_id == $User->medical_center_id))
            return true;
    }

    public function update(User $User, Package $Package)
    {
        if(
            $User->hasRole('Admin') ||
            ($User->hasRole('Supervisor') && $Package->user->medical_center_id == $User->medical_center_id ) ||
            $Package->user_id == $User->id
        )
            return true;
    }

    public function verifyPackage(User $User, Package $Package)
    {
        if($User->hasRole('Admin') || ($User->hasRole('Supervisor') && $Package->user->medical_center_id == $User->medical_center_id))
            return true;
    }

}