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With the passage in 2016 of the International Megan's Law, sex offenders are prohibited from entering the country of Thailand. This article (https://chrissmith.house.gov/news/documentsingle.aspx?DocumentID=400124) discusses the law and specifically notes that Thailand turned away over 160 sex offenders last year alone. Even before the passage of the law last year however, Thailand was very restrictive, given that it is known as a country popular with sex offenders. Indeed, the website for the Royal Thai Consulate states as follows:
PLEASE READ BEFORE YOU PROCEEED Possession of a visa alone does not guarantee entry into Thailand. The permission to enter the country depends on the discretion of immigration officers at any immigration checkpoints. Period of stay to be granted are determined by the immigration authorities upon arrival. Every application for a visa will be considered on its own merits. The Royal Thai Consulate-General reserves the rights to reject an application without having to provide a reason.Furthermore, a sex offender that is on probation/parole would have to notify the parole/probation department of any plans to travel outside the state.
the passport is only one part, you need visa as well and I do not think Thailand will issue you one