Yes, most papers need to be checked again. Paper duplication checking is a means to prevent plagiarism and other academic misconduct, and it is also an important measure to ensure the quality and originality of academic research. Paperless duplicate checking system is a high utilization system, which is suitable for most papers.

Different schools or institutions may have different requirements and standards for paper duplicate checking. Some schools or institutions may require that all papers be checked repeatedly, while others may only check certain types of papers. Therefore, when writing a paper, you should understand the relevant requirements and standards, and write and check the duplicate as required.