Not just cheap methods - even if the methods are better, they have a history of not being followed correctly [0][1][2].

[0] https://nypost.com/2017/02/10/thousands-of-convicts-told-tha...

[1] https://www.nytimes.com/2003/03/16/weekinreview/the-nation-y...

[2] https://www.kuer.org/post/private-utah-dna-lab-faces-scrutin...