It’s illegal in Colombia to publish new poll data less than 7 days before an election. The final round of the country’s presidential election is next Sunday, so this is it.

La Silla Vacía maintains a weighted poll of polls, sort of 538 style. It shows Gustavo Petro and Rodolfo Hernandez within 0.7 points of each other. And we’re not going to see any more polling after this.

With this close of a vote, and this much uncertainty, the looming question for the evening of the 19th and the days immediately afterward is: will the loser and his base of supporters concede? Or will the second half of June be a scary time of anger, fear, and disorder in Colombia?

If Petro wins by a razor-slim margin and Rodolfo Hernández rejects it: Hernández has picked up support from some wealthy and far-right elements who don’t have a history of playing by the rules. Though the political bosses, landowners and others who supported paramilitarism 15-20 years ago probably can’t force non-recognition of a Petro victory, they can spend the succeeding weeks and months making much of the country ungovernable and violent if they don’t accept the outcome. There also appears to be white-hot hatred of Petro in some corners of the military, and while I don’t foresee unconstitutional saber-rattling during the days following the election, I can’t dismiss the possibility either.

If Hernández wins by a razor-slim margin and Gustavo Petro rejects it: Petro’s supporters include core participants in last year’s national strike, which paralyzed the country for two months. They can control the streets again. And don’t expect Colombia’s National Police to obey proper use of force standards when they respond: they have little record of doing that in the past.

The second half of June could be really complicated.