Reports Of Drink Spiking Treble In Hertfordshire
19 September 2018, 09:28 | Updated: 19 September 2018, 12:06
There are similar figures in the Thames Valley area, where reported cases have increased from 16 in 2015 to 45 in 2017.
All those reports included the words 'drink' and 'spiking' or 'lacing'.
Former Home Office toxicologist Jim Campbell says it's the tip of the iceberg.
"A lot of it isn't reported because after the event people can't remember what's happened," he said.
"And they rack their brains - they feel they haven't got enough information or evidence to go to the police.
"And I think if they go to the police they don't have any evidential material so the police wouldn't take them seriously."