If you would want to hire individual employees instead of firms for medical marketing service, it would be best to give them a test first. This will give you the assurance that they will really perform well once hired. Of course, it is not really safe to just hire individual employees as compared to hiring established firms. However, if you have scrutinized these potential employees well, it would be very easy to know if they are good for your company or not.
You can actually test them based on their skills on marketing. You can also test them through an interview to determine if they have good communication skills or not. You might also want to test their promptness when it comes to giving back the results that you have asked from them. By then, you are assured that nothing wrong will happen the moment you hire them. It will be a lot easier than you think of.