No, turnitin cannot detect essays bought online. When you ask a professional writer to write your essay online, it is usually written from scratch. Normally, the instructions that you provide are taken into consideration so that you only get a custom written essay papers. Expert writers never entertain plagiarism. They know exactly what students can go through when they turn in some copied essays, hence they work hard to ensure that turnitin do not detect essays bought online from them. All essays bought online from experts are original, and will definitely pass all plagiarism tests.