'Voodoo'
Finally, there are the 'voodoo' type spells, for which the province of Surin (next to the Cambodian border) is famous. According to the Thai folklore, the people from Surin are very adapt at making potions that when mixed through the food or drink of a person will cause the victim to be very susceptible to the wishes of the person giving him the potion.
The most common use of this seems to be women giving it to men, these men will then fall in love with the woman and she will take all their money before moving on to the next. Yes, that's right, love potions!
Whereas I seriously doubt this works, there are a lot of Thais who will swear to it that they do. And they all seem to know someone who lost a husband (or a wife) to these potions.
Mia nois (minor wifes) are said to use these spells as well, in order to take away the man from the mia luang (major wife).
What they will do is take a sanitary napkin with menstrual blood, burn it and mix the ashes with the food of the victim. The longer the man will eat these ashes the more he will forget his mia luang.
Another method involves a "phoo moo" (a kind of fortune teller/witchdoctor). The phoo moo will make two dolls (one female, one male) using nails, hair and a picture of the people involved. These dolls are then tied together, facing each other, with white string and then buried in the ground beneath the house. This will keep the man at home.