Drink spiking is when someone puts alcohol or drugs into someone else's drink without their knowledge or consent. This may have happened to you if suddenly, everything goes black, and you barely remember what happened. The nightmare of memory loss, loss of control and shame can be caused by what are variously known as date rape drugs, knockout drops and roofies, the latter referring to the drug Rohypnol. Whatever they are called, their effects are insidious, barely detectable and act quickly. But there are ways you can try and establish whether you have fallen victim to drink spiking, what the...