No, it is not necessary. You can read more about such law at http://www.labor.mo.gov/posters2.htm
According to the U.S. Department of Labor, all emplorers must display a labor law compliance poster somewhere in the workplace. Employees must be able to see this poster and understand his or her rights.
Washington state law requires the posting of minimum wage poster in any business with employees. Businesses display these posters in order to comply with the law and avoid fines. The purpose of the posters in to ensure that employees are aware of their minimum wage rights.
You can order a minimum wage poster online at www.laborlawcenter.com. This poster must be hung in an area taht employees can see.
A California Labor Law poster will be posted in some capacity in every licensed business in California. These posters must be posted to be visible to all employees, and are usually found in a lunch area, affixed to a wall.
Sequential
A labor poster can keep employees informed about the discrimination policies in the workplace. An employee who is aware of the policies is less likely to discriminate.
Business Know-How is a website which sells forklift safety posters along with lots of other things you might need for your business. The URL for the poster is http://www.businessknowhow.net/safetyposters/trucksafety.asp
The federal goverenment specifically addresses which companies must display the poster. This information can be obtained from the Department of Labors Website
You need to put in a request with the Virginia Department of Labor. Request a poster using this form: http://www.doli.virginia.gov/publications/poster_form.html
A minimum wage poster is published by the Department of Labor, either the federal department or individual state labor departments. It is required to be displayed at most workplaces and contains information regarding the minimum wage for employees.
You must have the posters hung by law. You can request your posters at www.laborlawposter.us .
It depends on what business you have but most likely you do have to. People who must post it are private employers engaged in a business affecting commerce.