Guatemala immigration ripoff

Just a heads up. Immigration at Guatemala Melchor are ripping off foreign tourists entering Guatemala. I took a Canadian friend, who had 2 days left on his Belizean visa, to Melchor. The lady stamping his passport told him he had to pay $Bz100 to enter Guatemala for 5 hours. It was important to get into Melchor for medicines., so he had to pay it. I have never heard this happening but talking to others they said it has happened to them. So just have a heads up on this scam.