Can I be arrested for theft regarding time card fraud?

Question Details: I work for a day labor company and I get paid at the end of everyday when I bring my ticket time sheet back to the office. The manager of the company that you get sent to work for the day fills out the ticket, writes in how many hours you worked for the day, signs and dates it. I bring the ticket back to the office and my company pays me out. Well, I was working for the same place everyday for a couple of months. I got into an argument with a manager and quit going. I have been filling out my own tickets, writing in 8 to 10 hours a day, forging a signature and taking the tickets back to the office everyday and get paid for hours I have not worked. I have been doing this for about 4 months now and that company continues to pay the day labor company I work for every week. I just stopped doing this a couple days ago but I think there is a small chance that company might find out. If they do what course of action can they take against me? They have already paid for the hours I worked. Since they already paid and didn't take the time to look over the bill my company sent them they send them a bill for the hours I work every week and this has been happening for months is there anything they can do to me? Can I still legally get into trouble for theft even if they paid the bill and continued to do so every week for months?

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