To explain 'in place' in simple words is something which is ready and all set to be used.
Suppose you have started a new company. You have bought a place, got it furnished and in the interiors done, computers installed and even pre-hired the employees to work for it. The only thing which is left to be done to get the business going is 'installing the software or the system' via which you will be conduting your business. Now you say -
- Everything is in place except the systems. (meaning - everything is ready for the work to begin except the software system. As soon as the systems are installed the work will begin)
Once you get the software installed on the computers in your company then you can say -
- We all are raring to go about the business now that the systems are in place. (Systems are ready for work)
So 'in place' is used for the systems, methods or anything that gets the respective job started. In your example it is Enhanced Ebbola screening.
In your example (They have enhanced Ebola screening in place) the letter 'e' in enhanced should be written in capital.
Because of the letter 'e' is written in small it appears like it is a verb. But it is not a verb, it is an adjective.
So now the sentence would be --
They have Enhanced Ebola screening in place. (The Enhanced Ebbola screening is all ready to be used)
More examples of Enhanced -
- Enhanced Computer Systems
- Enchanced Security Systems
- Enhanced Battery