In what circumstances must obstacles to free moment caused by differing national law be acceptable?
What kind of national laws are capable of being MEGR?
Cassis De Djion (Cassis rule of reason) principal. provides justification beyond art 36.
import of Cassis to Germany.
Article 34 TFEU
supermarket selling at loss to increase its sale and capture shoppers
Article 30 TFEU
Mandatory requirement under Cassis de Djion
Article 151 TFEU
Article 153 of TFEU
H & S
Article 157 TFEU
Article 156 TFEU
Foster v British gas 
Defines public body.
Van Gend en Loos v netherlands adminstratie der Blastingen
working time directive
Von Colson principal (principal of indirect effect)
two female social workers claim discrimination and seeking remedy form German Court.
Direct effect/ directly effective
Dual vigilance (EU context)
Commission v. UK: Re UHT Milk
protection of health.
Answering questions regarding art 34
Cassis mandatory requirement