Flat Flyers Company manufactures a popular line of remote airplanes. Flat Flyers employs 125 workers and keeps their employment records on time sheets that show how many hours the employee works each week. On Friday the shop foreman collects the time sheets, checks them for accuracy, and delivers them to the payroll department for preparation of paychecks. The treasurer signs the paychecks and returns the checks to the payroll department for distribution to the employees. Identify the main internal control weakness in this situation, state how the weakness can hurt Flat Flyers, and propose a way to correct the weakness.