是的，洋金花应该不可能制服人。
目前唯一可以制服人的喷雾剂就是辣椒喷雾剂（pepper spray），不然警察不用用枪，用喷雾剂就好了。 下面这个Website 说的挺好
http://jordynredwood.blogspot.com/2012/10/author-question-can-chloroform-be.html
Must the substance be sprayed? I'm not aware of any substance that could be sprayed that would just knock a person out, leaving them relatively unharmed with their breathing intact. After all, the police would probably readily use it in their work as it wouldn't be as irritating as pepper spray, the taser, or as lethal as a bullet.
