That’s not quite accurate.
First, there are very, very specific limitations as to what a conference of bishops can and cannot do. In the area of legislation, Canon 455 covers those limitations:
Can. 455 §1. A conference of bishops can **only **issue general decrees in cases where universal law has prescribed it or a special mandate of the Apostolic See has established it either motu proprio or at the request of the conference itself.
§2. The decrees mentioned in §1, in order to be enacted validly in a plenary meeting, must be passed by at least a two thirds vote of the prelates who belong to the conference and possess a deliberative vote.
They do not obtain binding force unless they have been legitimately promulgated after having been reviewed by the Apostolic See.
§3. The conference of bishops itself determines the manner of promulgation and the time when the decrees take effect.
§4. In cases in which neither universal law nor a special mandate of the Apostolic See has granted the power mentioned in §1 to a conference of bishops, the competence of each diocesan bishop remains intact,
nor is a conference or its president able to act in the name of all the bishops unless each and every bishop has given consent.
Doctrinal declarations (such as Archbishop Weakland’s “Economic Justice for All” or Bishop Blaire’s letter) are covered by Motu Proprio
Apostolos Suos, which states in its complementary norms:
Art. 1. – In order that the doctrinal declarations of the Conference of Bishops referred to in No. 22 of the present Letter may constitute authentic magisterium and be published in the name of the Conference itself,
they must be unanimously approved by the Bishops who are members, or receive the recognitio of the Apostolic See if approved in plenary assembly by at least two thirds of the Bishops belonging to the Conference and having a deliberative vote.
Art. 2. –
No body of the Episcopal Conference, outside of the plenary assembly, has the power to carry out acts of authentic magisterium. The Episcopal Conference cannot grant such power to its Commissions or other bodies set up by it.
As
the Holy Father said to some Brazilian bishops a couple of years ago:
The Bishops’ Conference therefore coordinates the Bishops’ efforts and intentions, becoming an instrument that enables each to share his burdens;
but it must not become a parallel or substitute of the ministry of each one of the Bishops. In other words it must neither change its relationship with the respective particular Church or with the Episcopal College
nor make itself an intermediary between the Bishop and the See of Peter.
The bottom line is that if Archbishop Weakland writes a document, it’s his document (
unless the norms in Canon Law or Apostolos Suos are followed). Likewise, Bishop Blaire. And so on and so forth.