Should every business have a written policy addressing expected employee behavior? Why or why not?

Usually it is expected that the employee read this document and sign an acknowledgement that they have read it at the time of hiring.

yes, they should. if employees don't have a set doctrine that they need to follow, you'll end up with harrassment cases against you, as well as other destructive behaviors. with a signed agreement regarding ethical and moral, as well as productive behavior expectations, it releases you, the employer from liability from potential lawsuits in that regard.

Yes, because if the punishment isn't uniform.

If you don't fire someone for committing this certain offence then you can't fire anyone of the same stature for the same offence.

yes, because

Yes they should not only will it protect the company in cases of liability, but also the employee. If there's a contract you know what's expected.

Yes to cover their butts if they decide to dicipline the employee it needs to be in the companies policies that what they did was an infraction in the first place!

if u r owner ; the employees first duty is to gave respect and
if ur labour : then its necessary to take respect.

I would be surprised to find a business out there that doesn't have a written policy, unless maybe it's a family-owned business run by members of the same family without employees from the general public.

Even in school (or at least the one where I teach), the students are given a copy of the student handbook, and have to sign a paper stating that they have received this and read it and understand it. What's funny about that is that most of them know the student handbook better than the principal does!

Doing this saves the employer a lot of hassles. This way, everybody knows what is the expected behavior and they stay out of trouble!
It is also a chance for an employer to put their staff where they want them because most people who are desperate to get a job, will sign anything just to get in!!

Absolutely.

If you don't communicate expectations to your employees then how can they be judged if doing poorly OR going above and beyond.

I would say keep it simple and easy to remember.

Dress code, attendance, work performance.

They shoould have.Now a days most of the problems starts from employee's behaviour.Hence there is a code of conduct.And it is necessary.

In this day and time--- absolutely. HR management can be a crucial part of your business success. We live in a litigious society--- it's sad, but necessary when your business assets are vulnerable. Having to pay a prolonged unemployment settlement, or settle a lawsuit filed by a disgruntled employee dismissed (sometimes) for a very just cause can be costly.

EVERY BUSINESS??? Probably Not. I'm sure a Plumber that owns his/her own business and is a sole proprietor and only employee can probably pass on that.

There are two reasons for written policies around behavior and conduct:

1. It sets clear expectations, i.e. is a form of communication to the employees

2. LIABILITY - Reality: Most corporate written policies on conduct are to limit the corporate liability exposure should an employee "cross the line" or commit fraud. Without the written policy the company increases its exposure to lawsuit etc.

So, the short answer is that's it's ALWAYS smart to have a set of standard policies on employee conduct and behavior.

Final Word: Don't Reinvent the wheel. If you are thinking about this from the perspective of a smaller company, there are MANY resources out there to help you get the 'standard' set up. I've added two links, one to a website that provides a whole host of HR policies (these happen to also include some Wyoming specific; just because it was the first I looked at). The second is to a web site (there are many) that sells the language and policies themselves. I'm not affiliated with either, don't know the quality of what I've linked and the links serve as nothing more than examples. Personally, the second link looks interesting just from a cursory look.
Take Care.

Yes. It helps protect both the employer and employee from misunderstandings. It helps alleviate stress for the employee if they know exactly what's expected of them. It should be read and signed by both employee and employer, then it's a discipline tool later if needed.