code: func (m *MemoryManager) Get(id string) (Policy, error) {
  	m.RLock()
  	defer m.RUnlock()
  	p, ok := m.Policies[id]
  	if !ok {
  		return nil, errors.New("Not found")
  	}
  
  	return p, nil
  }
docs: // Get retrieves a policy.