Of course doing it correctly is more difficult. Of course serving justice is more difficult. Of course upholding the liberties of individuals takes more care and effort. The more short cuts you take with these things the easier it is for prosecutors and police officers to do their job.
The purpose of the system isn't to make police officers or prosecutors jobs easy, it's to uphold the law in service to society.
Of course doing it correctly is more difficult. Of course serving justice is more difficult. Of course upholding the liberties of individuals takes more care and effort. The more short cuts you take with these things the easier it is for prosecutors and police officers to do their job.
The purpose of the system isn't to make police officers or prosecutors jobs easy, it's to uphold the law in service to society.