Plastic handcuffs, are lightweight plastic strips that look like electrical cable ties. Soldiers and police can carry a lot of them at once. This is useful for some situations, such as during big protests and riots. In recent years, airlines have started to carry plastic handcuffs to restrain troublesome passengers. Disposable handcuffs could be considered cost-inefficient. This is because they cannot be loosened, and have to be cut off to let a restrained person be fingerprinted, or to use the bathroom.